diff --git a/app/controllers/concerns/create_avis_concern.rb b/app/controllers/concerns/create_avis_concern.rb
index e7c34495c..81c7dd3a9 100644
--- a/app/controllers/concerns/create_avis_concern.rb
+++ b/app/controllers/concerns/create_avis_concern.rb
@@ -10,28 +10,41 @@ module CreateAvisConcern
     # the :emails parameter is a 1-element array.
     # Hence the call to first
     # https://github.com/rails/rails/issues/17225
-    emails = create_avis_params[:emails].first.split(',').map(&:strip)
+    expert_emails = create_avis_params[:emails].first.split(',').map(&:strip)
+    allowed_dossiers = [dossier]
+
+    if create_avis_params[:invite_linked_dossiers].present?
+      allowed_dossiers += dossier.linked_dossiers
+    end
 
     create_results = Avis.create(
-      emails.map do |email|
-        {
-          email: email,
-          introduction: create_avis_params[:introduction],
-          claimant: current_instructeur,
-          dossier: dossier,
-          confidentiel: confidentiel
-        }
+      expert_emails.flat_map do |email|
+        allowed_dossiers.map do |dossier|
+          {
+            email: email,
+            introduction: create_avis_params[:introduction],
+            claimant: current_instructeur,
+            dossier: dossier,
+            confidentiel: confidentiel
+          }
+        end
       end
     )
 
     persisted, failed = create_results.partition(&:persisted?)
 
     if persisted.any?
-      sent_emails_addresses = persisted.map(&:email_to_display).join(", ")
-      flash.notice = "Une demande d'avis a été envoyée à #{sent_emails_addresses}"
+      sent_emails_addresses = []
       persisted.each do |avis|
-        dossier.demander_un_avis!(avis)
+        avis.dossier.demander_un_avis!(avis)
+
+        if avis.dossier == dossier
+          AvisMailer.avis_invitation(avis).deliver_later
+          sent_emails_addresses << avis.email_to_display
+        end
       end
+
+      flash.notice = "Une demande d'avis a été envoyée à #{sent_emails_addresses.uniq.join(", ")}"
     end
 
     if failed.any?
@@ -41,13 +54,13 @@ module CreateAvisConcern
 
       # When an error occurs, return the avis back to the controller
       # to give the user a chance to correct and resubmit
-      Avis.new(create_avis_params.merge(emails: [failed.map(&:email).join(", ")]))
+      Avis.new(create_avis_params.merge(emails: [failed.map(&:email).uniq.join(", ")]))
     else
       nil
     end
   end
 
   def create_avis_params
-    params.require(:avis).permit(:introduction, :confidentiel, emails: [])
+    params.require(:avis).permit(:introduction, :confidentiel, :invite_linked_dossiers, emails: [])
   end
 end
diff --git a/app/models/avis.rb b/app/models/avis.rb
index 5696d6411..f30cec28b 100644
--- a/app/models/avis.rb
+++ b/app/models/avis.rb
@@ -12,7 +12,6 @@ class Avis < ApplicationRecord
 
   before_validation -> { sanitize_email(:email) }
   before_create :try_to_assign_instructeur
-  after_create :notify_instructeur
 
   default_scope { joins(:dossier) }
   scope :with_answer, -> { where.not(answer: nil) }
@@ -24,6 +23,7 @@ class Avis < ApplicationRecord
   # The form allows subtmitting avis requests to several emails at once,
   # hence this virtual attribute.
   attr_accessor :emails
+  attr_accessor :invite_linked_dossiers
 
   def email_to_display
     instructeur&.email || email
@@ -49,10 +49,6 @@ class Avis < ApplicationRecord
 
   private
 
-  def notify_instructeur
-    AvisMailer.avis_invitation(self).deliver_later
-  end
-
   def try_to_assign_instructeur
     instructeur = Instructeur.find_by(email: email)
     if instructeur
diff --git a/app/models/champ.rb b/app/models/champ.rb
index e64ecd583..f2e40be11 100644
--- a/app/models/champ.rb
+++ b/app/models/champ.rb
@@ -11,7 +11,7 @@ class Champ < ApplicationRecord
   belongs_to :etablissement, dependent: :destroy
   has_many :champs, -> { ordered }, foreign_key: :parent_id, inverse_of: :parent, dependent: :destroy
 
-  delegate :libelle, :type_champ, :order_place, :mandatory?, :description, :drop_down_list, :exclude_from_export?, :exclude_from_view?, :repetition?, to: :type_de_champ
+  delegate :libelle, :type_champ, :order_place, :mandatory?, :description, :drop_down_list, :exclude_from_export?, :exclude_from_view?, :repetition?, :dossier_link?, to: :type_de_champ
 
   scope :updated_since?, -> (date) { where('champs.updated_at > ?', date) }
   scope :public_only, -> { where(private: false) }
diff --git a/app/models/dossier.rb b/app/models/dossier.rb
index 497ddd0f4..07d5e73fc 100644
--- a/app/models/dossier.rb
+++ b/app/models/dossier.rb
@@ -517,6 +517,10 @@ class Dossier < ApplicationRecord
     self.individual = Individual.create_from_france_connect(fc_information)
   end
 
+  def linked_dossiers
+    Dossier.where(id: champs.filter(&:dossier_link?).map(&:value).compact)
+  end
+
   private
 
   def log_dossier_operation(author, operation, subject = nil)
diff --git a/app/models/type_de_champ.rb b/app/models/type_de_champ.rb
index 6d7903eaa..249c1b6f4 100644
--- a/app/models/type_de_champ.rb
+++ b/app/models/type_de_champ.rb
@@ -157,6 +157,10 @@ class TypeDeChamp < ApplicationRecord
     type_champ == TypeDeChamp.type_champs.fetch(:repetition)
   end
 
+  def dossier_link?
+    type_champ == TypeDeChamp.type_champs.fetch(:dossier_link)
+  end
+
   def public?
     !private?
   end
diff --git a/app/views/instructeurs/avis/instruction.html.haml b/app/views/instructeurs/avis/instruction.html.haml
index b8d5eb2f9..c396cd221 100644
--- a/app/views/instructeurs/avis/instruction.html.haml
+++ b/app/views/instructeurs/avis/instruction.html.haml
@@ -28,7 +28,7 @@
           = f.submit 'Envoyer votre avis', class: 'button send'
 
   - if !@dossier.termine?
-    = render partial: "instructeurs/shared/avis/form", locals: { url: avis_instructeur_avis_path(@avis), must_be_confidentiel: @avis.confidentiel?, avis: @new_avis }
+    = render partial: "instructeurs/shared/avis/form", locals: { url: avis_instructeur_avis_path(@avis), linked_dossiers: @dossier.linked_dossiers, must_be_confidentiel: @avis.confidentiel?, avis: @new_avis }
 
   - if @dossier.avis_for(current_instructeur).present?
     = render partial: 'instructeurs/shared/avis/list', locals: { avis: @dossier.avis_for(current_instructeur), avis_seen_at: nil }
diff --git a/app/views/instructeurs/dossiers/avis.html.haml b/app/views/instructeurs/dossiers/avis.html.haml
index 544f6547d..65d661582 100644
--- a/app/views/instructeurs/dossiers/avis.html.haml
+++ b/app/views/instructeurs/dossiers/avis.html.haml
@@ -4,7 +4,7 @@
 
 .container
   - if !@dossier.termine?
-    = render partial: "instructeurs/shared/avis/form", locals: { url: avis_instructeur_dossier_path(@dossier.procedure, @dossier), must_be_confidentiel: false, avis: @avis }
+    = render partial: "instructeurs/shared/avis/form", locals: { url: avis_instructeur_dossier_path(@dossier.procedure, @dossier), linked_dossiers: @dossier.linked_dossiers, must_be_confidentiel: false, avis: @avis }
 
   - if @dossier.avis.present?
     = render partial: 'instructeurs/shared/avis/list', locals: { avis: @dossier.avis, avis_seen_at: @avis_seen_at }
diff --git a/app/views/instructeurs/shared/avis/_form.html.haml b/app/views/instructeurs/shared/avis/_form.html.haml
index a23a30ae2..1588633e3 100644
--- a/app/views/instructeurs/shared/avis/_form.html.haml
+++ b/app/views/instructeurs/shared/avis/_form.html.haml
@@ -6,6 +6,10 @@
     = f.email_field :emails, placeholder: 'Adresses email, séparées par des virgules', required: true, multiple: true, onchange: "javascript:DS.replaceSemicolonByComma(event);"
     = f.text_area :introduction, rows: 3, value: avis.introduction || 'Bonjour, merci de me donner votre avis sur ce dossier.', required: true
 
+    - if linked_dossiers.present?
+      = f.check_box :invite_linked_dossiers, value: false
+      = f.label :invite_linked_dossiers, t('helpers.label.invite_linked_dossiers', count: linked_dossiers.length, ids: linked_dossiers.map(&:id).to_sentence)
+
     .flex.justify-between.align-baseline
       - if must_be_confidentiel
         %p.confidentiel.flex
diff --git a/config/locales/models/avis/fr.yml b/config/locales/models/avis/fr.yml
index 9d1c31792..c458dffd9 100644
--- a/config/locales/models/avis/fr.yml
+++ b/config/locales/models/avis/fr.yml
@@ -5,3 +5,8 @@ fr:
     attributes:
       avis:
         answer: "Réponse"
+  helpers:
+    label:
+      invite_linked_dossiers:
+        one: Inviter aussi l'expert sur le dossier lié n° %{ids}
+        other: Inviter aussi l'expert sur les dossiers liés n° %{ids}
diff --git a/spec/controllers/instructeurs/avis_controller_spec.rb b/spec/controllers/instructeurs/avis_controller_spec.rb
index bd8bd8821..86e7a5bec 100644
--- a/spec/controllers/instructeurs/avis_controller_spec.rb
+++ b/spec/controllers/instructeurs/avis_controller_spec.rb
@@ -123,9 +123,10 @@ describe Instructeurs::AvisController, type: :controller do
       let(:intro) { 'introduction' }
       let(:created_avis) { Avis.last }
       let!(:old_avis_count) { Avis.count }
+      let(:invite_linked_dossiers) { nil }
 
       before do
-        post :create_avis, params: { id: previous_avis.id, avis: { emails: emails, introduction: intro, confidentiel: asked_confidentiel } }
+        post :create_avis, params: { id: previous_avis.id, avis: { emails: emails, introduction: intro, confidentiel: asked_confidentiel, invite_linked_dossiers: invite_linked_dossiers } }
       end
 
       context 'when an invalid email' do
@@ -180,6 +181,34 @@ describe Instructeurs::AvisController, type: :controller do
           it { expect(created_avis.confidentiel).to be(true) }
         end
       end
+
+      context 'with linked dossiers' do
+        let(:asked_confidentiel) { false }
+        let(:previous_avis_confidentiel) { false }
+        let(:dossier) { create(:dossier, :en_construction, :with_dossier_link, procedure: procedure) }
+
+        it do
+          expect(flash.notice).to eq("Une demande d'avis a été envoyée à a@b.com")
+          expect(Avis.count).to eq(old_avis_count + 1)
+          expect(created_avis.email).to eq("a@b.com")
+          expect(created_avis.dossier).to eq(dossier)
+        end
+
+        context 'checked' do
+          let(:invite_linked_dossiers) { true }
+          let(:created_avis) { Avis.last(2).first }
+          let(:linked_avis) { Avis.last }
+          let(:linked_dossier) { dossier.reload.linked_dossiers.first }
+
+          it do
+            expect(flash.notice).to eq("Une demande d'avis a été envoyée à a@b.com")
+            expect(Avis.count).to eq(old_avis_count + 2)
+            expect(created_avis.email).to eq("a@b.com")
+            expect(created_avis.dossier).to eq(dossier)
+            expect(linked_avis.dossier).to eq(linked_dossier)
+          end
+        end
+      end
     end
   end
 
diff --git a/spec/factories/dossier.rb b/spec/factories/dossier.rb
index 163109eac..313b49d40 100644
--- a/spec/factories/dossier.rb
+++ b/spec/factories/dossier.rb
@@ -54,10 +54,30 @@ FactoryBot.define do
 
     trait :with_dossier_link do
       after(:create) do |dossier, _evaluator|
+        # create linked dossier
         linked_dossier = create(:dossier)
-        type_de_champ = dossier.procedure.types_de_champ.find { |t| t.type_champ == TypeDeChamp.type_champs.fetch(:dossier_link) }
-        champ = dossier.champs.find { |c| c.type_de_champ == type_de_champ }
 
+        # find first type de champ dossier_link
+        type_de_champ = dossier.procedure.types_de_champ.find do |t|
+          t.type_champ == TypeDeChamp.type_champs.fetch(:dossier_link)
+        end
+
+        # if type de champ does not exist create it
+        if !type_de_champ
+          type_de_champ = create(:type_de_champ_dossier_link, procedure: dossier.procedure)
+        end
+
+        # find champ with the type de champ
+        champ = dossier.reload.champs.find do |c|
+          c.type_de_champ == type_de_champ
+        end
+
+        # if champ does not exist create it
+        if !champ
+          champ = create(:champ_dossier_link, dossier: dossier, type_de_champ: type_de_champ)
+        end
+
+        # set champ value with linked dossier
         champ.value = linked_dossier.id
         champ.save!
       end
diff --git a/spec/features/instructeurs/expert_spec.rb b/spec/features/instructeurs/expert_spec.rb
index c938c2f6d..08ceae5a3 100644
--- a/spec/features/instructeurs/expert_spec.rb
+++ b/spec/features/instructeurs/expert_spec.rb
@@ -8,7 +8,7 @@ feature 'Inviting an expert:' do
   let(:expert) { create(:instructeur, password: expert_password) }
   let(:expert_password) { 'mot de passe d’expert' }
   let(:procedure) { create(:procedure, :published, instructeurs: [instructeur]) }
-  let(:dossier) { create(:dossier, state: Dossier.states.fetch(:en_construction), procedure: procedure) }
+  let(:dossier) { create(:dossier, :en_construction, :with_dossier_link, procedure: procedure) }
 
   context 'as an Instructeur' do
     scenario 'I can invite an expert' do
@@ -20,6 +20,7 @@ feature 'Inviting an expert:' do
 
       fill_in 'avis_emails', with: 'expert1@exemple.fr, expert2@exemple.fr'
       fill_in 'avis_introduction', with: 'Bonjour, merci de me donner votre avis sur ce dossier.'
+      check 'avis_invite_linked_dossiers'
       page.select 'confidentiel', from: 'avis_confidentiel'
 
       perform_enqueued_jobs do
@@ -34,6 +35,8 @@ feature 'Inviting an expert:' do
         expect(page).to have_content('Bonjour, merci de me donner votre avis sur ce dossier.')
       end
 
+      expect(Avis.count).to eq(4)
+      expect(all_emails.size).to eq(2)
       invitation_email = open_email('expert2@exemple.fr')
       avis = Avis.find_by(email: 'expert2@exemple.fr')
       sign_up_link = sign_up_instructeur_avis_path(avis.id, avis.email)
diff --git a/spec/features/instructeurs/instruction_spec.rb b/spec/features/instructeurs/instruction_spec.rb
index 085b39417..52140f952 100644
--- a/spec/features/instructeurs/instruction_spec.rb
+++ b/spec/features/instructeurs/instruction_spec.rb
@@ -7,8 +7,7 @@ feature 'Instructing a dossier:' do
   let!(:instructeur) { create(:instructeur, password: password) }
 
   let!(:procedure) { create(:procedure, :published, instructeurs: [instructeur]) }
-  let!(:dossier) { create(:dossier, state: Dossier.states.fetch(:en_construction), procedure: procedure) }
-
+  let!(:dossier) { create(:dossier, :en_construction, procedure: procedure) }
   context 'the instructeur is also a user' do
     scenario 'a instructeur can fill a dossier' do
       visit commencer_path(path: procedure.path)
diff --git a/spec/models/avis_spec.rb b/spec/models/avis_spec.rb
index 4b807644c..74fb242e7 100644
--- a/spec/models/avis_spec.rb
+++ b/spec/models/avis_spec.rb
@@ -87,18 +87,6 @@ RSpec.describe Avis, type: :model do
     end
   end
 
-  describe '#notify_instructeur' do
-    context 'when an avis is created' do
-      before do
-        avis_invitation_double = double('avis_invitation', deliver_later: true)
-        allow(AvisMailer).to receive(:avis_invitation).and_return(avis_invitation_double)
-        Avis.create(claimant: claimant, email: 'email@l.com')
-      end
-
-      it { expect(AvisMailer).to have_received(:avis_invitation) }
-    end
-  end
-
   describe '#try_to_assign_instructeur' do
     let!(:instructeur) { create(:instructeur) }
     let(:avis) { Avis.create(claimant: claimant, email: email, dossier: create(:dossier)) }