Roy Keane was allegedly assaulted by a fan inside the Emirates Stadium on Sunday as he made his way to do his post-match duties for Sky Sports.
Mail Sport understands the 52-year-old former Manchester United captain was confronted by a man at the top of the West Stand as he was waiting for a lift to take him down to the pitchside area.
The man allegedly aimed a headbutt at Keane and hit the Irishman on the chest and chin, but was prevented from inflicting serious physical damage.
Footage circulating on social media last night showed Keane's Sky Sports colleague Micah Richards grappling with the man to restrain him, but the supporter had left the vicinity before security guards arrived.