diff --git a/pkg/channels/slack/slack.go b/pkg/channels/slack/slack.go
index 024b1b023..640a9ef64 100644
--- a/pkg/channels/slack/slack.go
+++ b/pkg/channels/slack/slack.go
@@ -122,6 +122,14 @@ func (c *SlackChannel) Send(ctx context.Context, msg bus.OutboundMessage) error
 		slack.MsgOptionText(msg.Content, false),
 	}
 
+	if msg.ReplyToMessageID != "" && threadTS == "" {
+		// Answer to the message by creating a Thread under it
+		opts = append(opts, slack.MsgOptionTS(msg.ReplyToMessageID))
+	} else if threadTS != "" {
+		// If we are already in a thread, continue in the thread
+		opts = append(opts, slack.MsgOptionTS(threadTS))
+	}
+
 	if threadTS != "" {
 		opts = append(opts, slack.MsgOptionTS(threadTS))
 	}