McGregor rose through the ranks at Celtic Park and had a season-long loan spell in England at current National League side Notts County during the 2013/14 season.
The midfielder used the experience and kicked on at Celtic, and is now rated as one of the Bhoys’ key men.
McGregor’s fellow Bhoys academy product Robertson has followed in his predecessor’s footsteps as he moved south of the border to join League One outfit Gillingham in September, and the midfielder revealed that if he is able to achieve even half of what the Scotland international has so far, he will be delighted.
The 19-year-old, who shares the same Celtic footballing DNA as McGregor, is hoping that he can emulate the 27-year-old’s success, but aims to carve out his career in his own way.
“It’s great looking at Callum and seeing him coming to a similar level in what I’m doing just now”, Robertson told The Athletic.
“If I can do half of what he’s achieved in the game, I’d be delighted.
“With the trophies he’s won, it’d be a real success.
“But I also want to do my own thing, and hopefully I can.”
Since arriving at Priestfield, Robertson has so far racked up five outings in all competitions for the League One side and will hope to continue his development under the watchful eye of Gills boss Steve Evans.