Sir Alex Ferguson was renowned for giving players the 'hairdryer treatment' - but Roy Keane wasn't one of them.
The Irishman had a successful partnership under the legendary boss as he spent 12 years at the Red Devils, eight as captain, winning a dozen major honours, including four Premier League titles.
But the pair's relationship plummeted when Keane went public with his desire to leave United at the end of the 2005/06 season. That prompted a bitter fallout with the former United midfielder claiming that he will never forgive Ferguson for the part he played in his departure, demanding an apology from Fergie.