McKay featured for Forest in the Championship match against Norwich at the City Ground on Tuesday evening.
The 22-year-old former Rangers winger started the game and played for 69 minutes, as the Reds won 1-0.
Daryl Murphy’s goal in the 77th minute proved to be the difference between the Reds and the Canaries.
Warburton has admitted that McKay, who joined Forest from Rangers in the Scottish Premiership in the summer transfer window, did not have a great game against Norwich.
"We make substitutions to try and change the game and add some more energy,” Warburton told Forest’s official website.
“Barrie McKay has been outstanding recently but he had a quieter game tonight so we thought Muzzy could get on and change it.”
McKay has been one of the best players for Forest so far this season, and the youngster is allowed to have one or two bad games.
The former Rangers winger has scored four goals and provided seven assists in 15 Championship starts for Forest so far this season.
Forest are very much in the race for the Championship playoffs this season.