diff --git a/app/controllers/manager/procedures_controller.rb b/app/controllers/manager/procedures_controller.rb
index 9ca75b503..eb9d3c6ef 100644
--- a/app/controllers/manager/procedures_controller.rb
+++ b/app/controllers/manager/procedures_controller.rb
@@ -47,12 +47,12 @@ module Manager
     end
 
     def add_administrateur
-      administrateur = Administrateur.by_email(params[:email])
+      administrateur = Administrateur.by_email(current_super_admin.email)
       if administrateur
-        procedure.administrateurs << administrateur
-        flash[:notice] = "L'administrateur \"#{params[:email]}\" est ajouté à la démarche."
+        AdministrateursProcedure.create(procedure: procedure, administrateur: administrateur, manager: true)
+        flash[:notice] = "L’administrateur \"#{administrateur.email}\" est ajouté à la démarche pour la journée."
       else
-        flash[:alert] = "L'administrateur \"#{params[:email]}\" est introuvable."
+        flash[:alert] = "Vous n’êtes pas connecté en tant qu’administrateur."
       end
       redirect_to manager_procedure_path(procedure)
     end
diff --git a/app/jobs/cron/purge_manager_administrateur_sessions_job.rb b/app/jobs/cron/purge_manager_administrateur_sessions_job.rb
new file mode 100644
index 000000000..29de55b38
--- /dev/null
+++ b/app/jobs/cron/purge_manager_administrateur_sessions_job.rb
@@ -0,0 +1,7 @@
+class Cron::PurgeManagerAdministrateurSessionsJob < Cron::CronJob
+  self.schedule_expression = "every day at 3 am"
+
+  def perform
+    AdministrateursProcedure.where(manager: true).destroy_all
+  end
+end
diff --git a/app/models/administrateurs_procedure.rb b/app/models/administrateurs_procedure.rb
index f0a883b04..1fd2002dc 100644
--- a/app/models/administrateurs_procedure.rb
+++ b/app/models/administrateurs_procedure.rb
@@ -2,6 +2,7 @@
 #
 # Table name: administrateurs_procedures
 #
+#  manager           :boolean
 #  created_at        :datetime         not null
 #  updated_at        :datetime         not null
 #  administrateur_id :bigint           not null
diff --git a/app/views/manager/procedures/show.html.erb b/app/views/manager/procedures/show.html.erb
index da0724ee8..492b787d7 100644
--- a/app/views/manager/procedures/show.html.erb
+++ b/app/views/manager/procedures/show.html.erb
@@ -64,9 +64,12 @@ as well as a link to its edit page.
       <dd class="attribute-data attribute-data--<%=attribute.html_class%>">
         <%= render_field attribute, page: page %>
         <% if attribute.name == 'administrateurs' %>
-          <%= form_tag(add_administrateur_manager_procedure_path(procedure), style: 'margin-top: 1rem;') do %>
-            <%= email_field_tag(:email, '', placeholder: 'Email', autocapitalize: 'off', autocorrect: 'off', spellcheck: 'false', style: 'margin-bottom: 1rem;width:24rem;') %>
-            <button>Ajouter un administrateur</button>
+          <% if procedure.administrateurs.find { |admin| admin.email == current_super_admin.email } %>
+            <p style="margin-top: 20px;">Vous êtes déjà administrateur sur cette démarche</p>
+          <% else %>
+            <%= form_tag(add_administrateur_manager_procedure_path(procedure), style: 'margin-top: 1rem;') do %>
+              <button>Devenir administrateur (pour la journée)</button>
+            <% end %>
           <% end %>
         <% end %>
       </dd>
diff --git a/db/migrate/20211006164955_add_manager_to_administrateurs_procedures.rb b/db/migrate/20211006164955_add_manager_to_administrateurs_procedures.rb
new file mode 100644
index 000000000..8e424a92b
--- /dev/null
+++ b/db/migrate/20211006164955_add_manager_to_administrateurs_procedures.rb
@@ -0,0 +1,5 @@
+class AddManagerToAdministrateursProcedures < ActiveRecord::Migration[6.1]
+  def change
+    add_column :administrateurs_procedures, :manager, :boolean
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 5c75e2aea..2d29640fd 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2021_10_01_143403) do
+ActiveRecord::Schema.define(version: 2021_10_06_164955) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -76,6 +76,7 @@ ActiveRecord::Schema.define(version: 2021_10_01_143403) do
     t.bigint "procedure_id", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.boolean "manager"
     t.index ["administrateur_id", "procedure_id"], name: "index_unique_admin_proc_couple", unique: true
     t.index ["administrateur_id"], name: "index_administrateurs_procedures_on_administrateur_id"
     t.index ["procedure_id"], name: "index_administrateurs_procedures_on_procedure_id"