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The 50-year-old Irishman has built a revered reputation for his no-nonsense approach, both on the field and off it, and his ruthless straight-talking criticism.
Keane, widely regarded as one the best Premier League midfielders of all time, lifted seven Premier League titles, a Champions League and four FA Cups with United.
The Sky Sports pundit was widely praised for his leadership as United captain, not to mention being one of the toughest players in football history.
Footage has now made the rounds of Keane’s elite mentality during United’s clash with Everton in 1999.
The former United star attempted to win a loose ball near the touchline, only for Ward to lunge in with a two-footed challenge that caught Keane.
Keane immediately bounced back to his feet and started to walk away, with the former Republic of Ireland international and Ward bumping into one another.
However, fans even suggested that it was Ward who bumped into Keane intentionally to provoke a response out of the Irishman.
“If this happened today, it would be a red card, GBH, leaving the scene of an accident and the victim would of rolled into [A&E],” one fan said.
Someone else posted: “Keane wouldn't give him the satisfaction, got up quickly as if to say, is that all you got?”
A third added: “Ward’s tackle backfired... When the stomper becomes the stompee [sic]. That's why Keane is like.... ‘I'm not even mad.’ Notice the shoulder barge by Ward afterwards.”
And a fourth wrote: “Took that like it was nothing... fast-forward today they'd be rolling all over the pitch crying their eyes out and screaming for the referee.”
While a fifth commented: “Keane took it like a real man should. Fair play to both of them actually for not making a soap opera out of it.”
Keane made an infamous exit from Old Trafford in 2005 after an explosive interview on MUTV.
The former United midfielder went on to play for Celtic before announcing his retirement from football in 2006.