Ibrox side Glasgow Rangers were beaten 2-0 by Celtic in their most recent match, with Kieran Tierney impressing.
Barton was impressed with Tierney during his brief time as a Rangers player, and the former Newcastle and Burnley midfielder has continued to be a big fan of the young Bhoys star.
Tierney was impressive form again, as Celtic beat Rangers 2-0 at Ibrox in their most recent match.
And Barton said: “I tell you who I was impressed with again, and I was impressed when we played you, Tierney. I think he looks one hell of a player.”
Tierney has won many admirers since breaking through at Celtic last season, with the youngster coping with every challenge thrown at him.
The full-back appears to have the potential to become a Celtic great, if he sticks with the Bhoys for the years ahead.
Celtic’s victory over Rangers extends their unbeaten run in Old-Firm derbies since Brendan Rodgers’ took charge, and means they now have an eight point gap over their Glasgow rivals.