diff --git a/src/Database/Database.csproj b/src/Database/Database.csproj
index 490cb576a7c6e5fa3f243c6f75bd477a9f01c8fe..01e3f96900b9612eb1a8ff73bec44928920d9f74 100644
--- a/src/Database/Database.csproj
+++ b/src/Database/Database.csproj
@@ -84,6 +84,7 @@
     <Compile Include="ReturnObjects\ActivatedFeatureObject.cs" />
     <Compile Include="Models\LogModel.cs" />
     <Compile Include="ReturnObjects\DisciplineObject.cs" />
+    <Compile Include="ReturnObjects\ExternalAuthenticatorsObject.cs" />
     <Compile Include="ReturnObjects\FeatureObject.cs" />
     <Compile Include="ReturnObjects\GitlabResourceTypeObject.cs" />
     <Compile Include="ReturnObjects\IReturnObject.cs" />
diff --git a/src/Database/Models/UserModel.cs b/src/Database/Models/UserModel.cs
index c77f15041693a5c895412ea1827aabea5d20d36a..7976069f7466a10264ee32e848b208e8ddc1e239 100644
--- a/src/Database/Models/UserModel.cs
+++ b/src/Database/Models/UserModel.cs
@@ -41,6 +41,15 @@ namespace Coscine.Database.Models
                 disciplines = user.UserDisciplinesUserIdIds.Select((discipline) => new DisciplineObject(discipline.Discipline.Id, discipline.Discipline.Url, discipline.Discipline.DisplayNameDe, discipline.Discipline.DisplayNameEn));
             }
 
+            var externalAuthenticatorModel = new ExternalAuthenticatorModel();
+            var externalAuthenticators = externalAuthenticatorModel.GetAllWhere(
+                (externalAuthenticator) => 
+                    (from relation in externalAuthenticator.ExternalIdsResourceTypeIdIds
+                        where relation.UserId == user.Id select relation).Any())
+                        .Select((externalAuthenticator) => 
+                            new ExternalAuthenticatorsObject(
+                                externalAuthenticator.Id, externalAuthenticator.DisplayName));
+
             if (user.Title == null && user.TitleId.HasValue)
             {
                 TitleModel titleModel = new TitleModel();
@@ -65,7 +74,8 @@ namespace Coscine.Database.Models
                 user.Organization,
                 user.Institute,
                 disciplines,
-                false);
+                false,
+                externalAuthenticators);
         }
 
         public int UpdateByObject(User user, UserObject userObject)
diff --git a/src/Database/ReturnObjects/ExternalAuthenticatorsObject.cs b/src/Database/ReturnObjects/ExternalAuthenticatorsObject.cs
new file mode 100644
index 0000000000000000000000000000000000000000..85fdab685116364ebb4dc8abbcca583f471ac2d1
--- /dev/null
+++ b/src/Database/ReturnObjects/ExternalAuthenticatorsObject.cs
@@ -0,0 +1,18 @@
+using System;
+
+namespace Coscine.Database.ReturnObjects
+{
+    [Serializable]
+    public class ExternalAuthenticatorsObject : IReturnObject
+    {
+        public Guid Id { get; set; }
+
+        public string DisplayName { get; set; }
+
+        public ExternalAuthenticatorsObject(Guid id, string displayName)
+        {
+            Id = id;
+            DisplayName = displayName;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Database/ReturnObjects/UserObject.cs b/src/Database/ReturnObjects/UserObject.cs
index f6340e6c902d68d2879ca69f9f44be5772891b65..959285634286b12f6297d863921085473b5e0a1a 100644
--- a/src/Database/ReturnObjects/UserObject.cs
+++ b/src/Database/ReturnObjects/UserObject.cs
@@ -30,7 +30,9 @@ namespace Coscine.Database.ReturnObjects
 
         public bool IsRegistered { get; set; }
 
-        public UserObject(Guid id, string displayName, string givenname, string surname, string emailAddress, bool hasProjectRole = false, TitleObject title = null, LanguageObject language = null, string organization = "", string institute = "", IEnumerable<DisciplineObject> disciplines = null, bool isRegistered = false)
+        public IEnumerable<ExternalAuthenticatorsObject> ExternalAuthenticators { get; set; }
+
+        public UserObject(Guid id, string displayName, string givenname, string surname, string emailAddress, bool hasProjectRole = false, TitleObject title = null, LanguageObject language = null, string organization = "", string institute = "", IEnumerable<DisciplineObject> disciplines = null, bool isRegistered = false, IEnumerable<ExternalAuthenticatorsObject> externalAuthenticators = null)
         {
             Id = id;
             DisplayName = displayName;
@@ -46,6 +48,8 @@ namespace Coscine.Database.ReturnObjects
 
             HasProjectRole = hasProjectRole;
             IsRegistered = isRegistered;
+
+            ExternalAuthenticators = externalAuthenticators;
         }
     }
 }