Winning twelve trophies across a decorated twelve year spell at the Theatre of Dreams, the former Republic of Ireland international departed for Celtic back in 2005.
With the anniversary of his signing in 1993 having just passed, MUTV's Sam Homewood asked the panel on this week's episode of The Debate if the United legend was the greatest to ever sport our armband.
Former Reds full-back Denis Irwin was quick to praise Keane, recalling memories of their early days spent together.
"He was an incredible signing, he really was," began Irwin. "I remember when he first came in, the team were going on pre-season to South Africa.