Callum McGregor calls for calm heads as Celtic face title rivals Rangers in final Old Firm of season April 28, 2022 Posted by Soccer Leave a comment Callum McGregor has urged his Celtic colleagues to keep cool heads as they bid to avenge their recent Scottish Cup semi-final defeat by Rangers on Sunday and place one hand on the cinch Premiership trophy. Source: Sport Soccer-.Independent Author: Share this post: Share on Facebook Tweet this! Share on LinkedIn Share on Google+ Share on Pinterest