Allan McGregor is a Rangers icon and one of the club’s best goalkeepers of all time. The retired stopper won 13 trophies during his career at Ibrox and will rightly be remembered as a legend who came up with massive moments for the club and vital saves. Any player can learn a thing or two from the vast experience earned by McGregor over his 22-year career and that even goes for the world’s best as proven by Manchester City star Ederson. READ MORE: Antonio Colak hints as to why Rangers stint never worked out as he admits Parma failureFootage from the club’s new ‘Together: Treble Winners’ docume…