The Hibernian boss knows very well how good the 24-year-old could be.
Former Celtic defender Alan Stubbs is backing Scott Allan to become a huge success at Parkhead, despite the fact that he is yet to start a single game for the Premiership leaders since joining the club in the summer, The Scottish Sun reports.
The 24-year-old has made five appearance for Ronny Deila's side in all competitions, but all of which have come from the bench.
Nevertheless, Hibernian boss Stubbs knows all too well what Allan is capable of, having worked with the reigning PFA Championship Players' Player of the Year at Easter Road last season. And he believes that Celtic supporters will see just how special a talent he is once he is starting games.
"He is a very talented lad and he will get his opportunity at Celtic," he said.
"I have said all along that Scott could play in the English Premier League, so if he can do that then he has definitely got a possibility of playing in Celtic's first team.
"You have seen little glimpses of him and those glimpses need to be more consistent.
"If he does that then Celtic have a potentially very exciting player," he added.
Despite Allan's undeniable potential, Celtic's dominance in the league has clearly made it difficult for Deila to justify making changes to a winning formula. The club are unbeaten in the Premiership since September, and now find themselves four points clear of early pace-setters Aberdeen, with a game in hand to potentially extend their lead.
However, with the hectic Christmas period ahead, Deila's squad may need refreshing to ensure that they do not allow Derek McInnes' men back into the race. That could well see Allan finally earn his first start.
And his former boss is certainly backing him to take that opportunity to show why Celtic signed him in the first place.