The 21-year-old has been rewarded for an impressive start to the season which has seen him strike four times for the Scottish champions.
The news was confirmed by Scotland Under-21 coach Billy Stark, who has seen him promoted from his squad.
Stark told Press Association Sport: "Andy Robertson has stepped up from the Under-21s and now Callum McGregor
Whilst it has not been the most successful of campaigns, the other part of it is players going through."
Source : PA
Source: PA