diff --git a/lib/integrations/slack/send_on_slack_service.rb b/lib/integrations/slack/send_on_slack_service.rb
index 50a69e02b170..aa9d3ad5bca0 100644
--- a/lib/integrations/slack/send_on_slack_service.rb
+++ b/lib/integrations/slack/send_on_slack_service.rb
@@ -58,10 +58,12 @@ def format_message_content
   end
 
   def message_text
-    if message.content.present?
-      message.content.gsub(MENTION_REGEX, '\1')
+    content = message.processed_message_content || message.content
+
+    if content.present?
+      content.gsub(MENTION_REGEX, '\1')
     else
-      message.content
+      content
     end
   end