The youngster put in a tremendous performance to help the Gers reach the Scottish Cup final.
Former Rangers boss Paul Le Guen has heaped praise upon Barrie McKay but has also challenged the youngster to take his performance in the Scottish Cup semi-final and repeat it on a regular basis, the Herald Scotland reports.
The 21-year-old was sensational at Hampden Park and beat Celtic goalkeeper Craig Gordon with a stunning effort six minutes into extra-time to put the Gers back in front after the game had finished 1-1 after 90 minutes.
And Le Guen - who endured a difficult spell in charge at Ibrox around a decade ago - admitted that McKay really impressed him, but suggested that he now faces a challenge trying to replicate that form over a sustained period of time.
"I liked watching some of the younger players, like Barrie McKay, who scored a fantastic goal. Players like him, they have real potential. When you speak about them after such a game, you can’t say whether they will play like that for a whole season. They still have to become real top-league players," he told the Herald Scotland.
"Doing that many seasons in a row is very different from having one or two very good games. But I think that some of them definitely have the potential and this should prove to them that they can do it."
The Frenchman did admit that the semi-final was the first time that he had seen Mark Warburton's men play this season (via Herald Scotland), which may explain why he was not entirely convinced whether McKay has the ability to maintain his form for a prolonged period.
The forward has been one of the Light Blues' most productive players this season, scoring five goals and contributing eight assists in the Scottish Championship to help the club secure the title and promotion back to the top flight.
So while Le Guen may not have a full understanding as to how important the youngster has been to Warburton's side this term, his challenge to McKay is arguably justified as his game will have to make a step-up next year in the Scottish Premiership, and while he was able to tear the Hoops apart on Sunday, he needs to prove that he can do that every single week.