diff --git a/vector/src/main/java/im/vector/app/features/analytics/extensions/AnalyticsExtensions.kt b/vector/src/main/java/im/vector/app/features/analytics/extensions/JoinedRoomExt.kt
similarity index 100%
rename from vector/src/main/java/im/vector/app/features/analytics/extensions/AnalyticsExtensions.kt
rename to vector/src/main/java/im/vector/app/features/analytics/extensions/JoinedRoomExt.kt
diff --git a/vector/src/main/java/im/vector/app/features/roomdirectory/roompreview/RoomPreviewActivity.kt b/vector/src/main/java/im/vector/app/features/roomdirectory/roompreview/RoomPreviewActivity.kt
index 394d738b26..a317019d49 100644
--- a/vector/src/main/java/im/vector/app/features/roomdirectory/roompreview/RoomPreviewActivity.kt
+++ b/vector/src/main/java/im/vector/app/features/roomdirectory/roompreview/RoomPreviewActivity.kt
@@ -40,6 +40,7 @@ data class RoomPreviewData(
         val roomAlias: String? = null,
         val roomType: String? = null,
         val topic: String? = null,
+        val numJoinedMembers: Int? = null,
         val worldReadable: Boolean = false,
         val avatarUrl: String? = null,
         val homeServers: List<String> = emptyList(),
@@ -69,6 +70,7 @@ class RoomPreviewActivity : VectorBaseActivity<ActivitySimpleBinding>(), Toolbar
                     roomName = publicRoom.name,
                     roomAlias = publicRoom.getPrimaryAlias(),
                     topic = publicRoom.topic,
+                    numJoinedMembers = publicRoom.numJoinedMembers,
                     worldReadable = publicRoom.worldReadable,
                     avatarUrl = publicRoom.avatarUrl,
                     homeServers = listOfNotNull(roomDirectoryData.homeServer)
diff --git a/vector/src/main/java/im/vector/app/features/roomdirectory/roompreview/RoomPreviewViewModel.kt b/vector/src/main/java/im/vector/app/features/roomdirectory/roompreview/RoomPreviewViewModel.kt
index bdb0a96e9e..b1fa0e974a 100644
--- a/vector/src/main/java/im/vector/app/features/roomdirectory/roompreview/RoomPreviewViewModel.kt
+++ b/vector/src/main/java/im/vector/app/features/roomdirectory/roompreview/RoomPreviewViewModel.kt
@@ -27,6 +27,9 @@ import im.vector.app.core.di.hiltMavericksViewModelFactory
 import im.vector.app.core.extensions.exhaustive
 import im.vector.app.core.platform.EmptyViewEvents
 import im.vector.app.core.platform.VectorViewModel
+import im.vector.app.features.analytics.AnalyticsTracker
+import im.vector.app.features.analytics.extensions.toAnalyticsRoomSize
+import im.vector.app.features.analytics.plan.JoinedRoom
 import im.vector.app.features.roomdirectory.JoinState
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.launchIn
@@ -44,9 +47,11 @@ import org.matrix.android.sdk.api.session.room.roomSummaryQueryParams
 import org.matrix.android.sdk.flow.flow
 import timber.log.Timber
 
-class RoomPreviewViewModel @AssistedInject constructor(@Assisted private val initialState: RoomPreviewViewState,
-                                                       private val session: Session) :
-        VectorViewModel<RoomPreviewViewState, RoomPreviewAction, EmptyViewEvents>(initialState) {
+class RoomPreviewViewModel @AssistedInject constructor(
+        @Assisted private val initialState: RoomPreviewViewState,
+        private val analyticsTracker: AnalyticsTracker,
+        private val session: Session
+) : VectorViewModel<RoomPreviewViewState, RoomPreviewAction, EmptyViewEvents>(initialState) {
 
     @AssistedFactory
     interface Factory : MavericksAssistedViewModelFactory<RoomPreviewViewModel, RoomPreviewViewState> {
@@ -243,6 +248,11 @@ class RoomPreviewViewModel @AssistedInject constructor(@Assisted private val ini
         viewModelScope.launch {
             try {
                 session.joinRoom(state.roomId, viaServers = state.homeServers)
+                analyticsTracker.capture(JoinedRoom(
+                        // Always false in this case (?)
+                        isDM = false,
+                        roomSize = state.numJoinMembers.toAnalyticsRoomSize()
+                ))
                 // We do not update the joiningRoomsIds here, because, the room is not joined yet regarding the sync data.
                 // Instead, we wait for the room to be joined
             } catch (failure: Throwable) {
diff --git a/vector/src/main/java/im/vector/app/features/roomdirectory/roompreview/RoomPreviewViewState.kt b/vector/src/main/java/im/vector/app/features/roomdirectory/roompreview/RoomPreviewViewState.kt
index 8488dd7267..b2cb43115d 100644
--- a/vector/src/main/java/im/vector/app/features/roomdirectory/roompreview/RoomPreviewViewState.kt
+++ b/vector/src/main/java/im/vector/app/features/roomdirectory/roompreview/RoomPreviewViewState.kt
@@ -33,6 +33,7 @@ data class RoomPreviewViewState(
 
         val roomName: String? = null,
         val roomTopic: String? = null,
+        val numJoinMembers: Int? = null,
         val avatarUrl: String? = null,
 
         val shouldPeekFromServer: Boolean = false,
@@ -56,6 +57,7 @@ data class RoomPreviewViewState(
             homeServers = args.homeServers,
             roomName = args.roomName,
             roomTopic = args.topic,
+            numJoinMembers = args.numJoinedMembers,
             avatarUrl = args.avatarUrl,
             shouldPeekFromServer = args.peekFromServer,
             fromEmailInvite = args.fromEmailInvite,
@@ -64,6 +66,6 @@ data class RoomPreviewViewState(
 
     fun matrixItem(): MatrixItem {
         return if (roomType == RoomType.SPACE) MatrixItem.SpaceItem(roomId, roomName ?: roomAlias, avatarUrl)
-            else MatrixItem.RoomItem(roomId, roomName ?: roomAlias, avatarUrl)
+        else MatrixItem.RoomItem(roomId, roomName ?: roomAlias, avatarUrl)
     }
 }