diff --git a/app/controllers/administrateurs/routing_controller.rb b/app/controllers/administrateurs/routing_controller.rb
new file mode 100644
index 000000000..404526e17
--- /dev/null
+++ b/app/controllers/administrateurs/routing_controller.rb
@@ -0,0 +1,32 @@
+module Administrateurs
+  class RoutingController < AdministrateurController
+    include Logic
+
+    before_action :retrieve_procedure
+
+    def update
+      left = champ_value(targeted_champ)
+      right = constant(value)
+
+      @procedure.groupe_instructeurs.find(groupe_instructeur_id).update!(routing_rule: ds_eq(left, right))
+    end
+
+    private
+
+    def targeted_champ
+      routing_params[:targeted_champ].to_i
+    end
+
+    def value
+      routing_params[:value]
+    end
+
+    def groupe_instructeur_id
+      routing_params[:groupe_instructeur_id]
+    end
+
+    def routing_params
+      params.permit(:targeted_champ, :value, :groupe_instructeur_id)
+    end
+  end
+end
diff --git a/config/routes.rb b/config/routes.rb
index fc00f9896..e187cecd1 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -506,6 +506,8 @@ Rails.application.routes.draw do
         delete :delete_row, on: :member
       end
 
+      patch :update, controller: 'routing', as: :routing_rules
+
       put 'clone'
       put 'archive'
       get 'publication' => 'procedures#publication', as: :publication
diff --git a/spec/controllers/administrateurs/routing_controller_spec.rb b/spec/controllers/administrateurs/routing_controller_spec.rb
new file mode 100644
index 000000000..841bcd92f
--- /dev/null
+++ b/spec/controllers/administrateurs/routing_controller_spec.rb
@@ -0,0 +1,28 @@
+describe Administrateurs::RoutingController, type: :controller do
+  include Logic
+
+  before { sign_in(procedure.administrateurs.first.user) }
+
+  describe '#update' do
+    let(:procedure) { create(:procedure, types_de_champ_public: [{ type: :drop_down_list, libelle: 'Votre ville', options: ['Paris', 'Lyon', 'Marseille'] }]) }
+    let(:gi_2) { procedure.groupe_instructeurs.create(label: 'groupe 2') }
+    let(:drop_down_tdc) { procedure.draft_revision.types_de_champ.first }
+    let(:params) do
+      {
+        procedure_id: procedure.id,
+        targeted_champ: drop_down_tdc.stable_id,
+        value: 'Lyon',
+        groupe_instructeur_id: gi_2.id
+      }
+    end
+
+    before do
+      sign_in(procedure.administrateurs.first.user)
+      post :update, params: params, format: :turbo_stream
+    end
+
+    it do
+      expect(gi_2.reload.routing_rule).to eq(ds_eq(champ_value(drop_down_tdc.stable_id), constant('Lyon')))
+    end
+  end
+end