The 21-year-old's long-term future at Ibrox hung in the balance this time last year after the midfielder spent the 2014-15 season on loan at Raith Rovers.
But McKay was retained for the 2015-16 campaign by Warburton - who was appointed last summer - and the Gers star has certainly vindicated that faith, starting 45 games for the Glasgow giants in all competitions, scoring 10 goals along the way to emerge as one of their strongest performers this season.
In doing so, the Scotland Under-21 international, who joined the club in 2012, has played a big role in helping the Gers to Scottish Championship and Petrofac Cup glory, while Warburton's side are also in the final of the Scottish Cup after McKay's wonder goal in the semi-final against Celtic helped them get there.
And the man himself reveals to Rangers' website that his form more or less stems from a fear of unimpressing Warburton.
“I maybe didn’t think at this time last year that I would be here and lifting the trophy today as I didn’t know where I was going to be last summer," he said.
“I always planned to be playing here and when the gaffer came here he told everyone that it was a clean slate and he put a lot of confidence in me, He told me that I had to go and impress and thankfully I’ve done that.”