Keane was allegedly confronted by a man in the West Stand as he made his way down to carry out his post-match duties on the sidelines.
The man allegedly aimed a headbutt at Keane but did not cause any serious physical harm to the former Manchester United midfielder.
Video footage on social media showed Keane’s Sky Sports colleague Micah Richards struggling to hold him down.
Keane was then escorted to the sidelines where he continued his broadcast.
A statement from the Metropolitan Police said: “Police are investigating an alleged assault at the Emirates Stadium during a match between Arsenal and Manchester United on Sunday.” There were no arrests. The investigation is ongoing.”
Sky said in a statement: “We understand that police were investigating a suspected attack by a member of the public immediately prior to the footage being shared on social media. “In the footage shown, Micah Richards acted to defuse the situation.”
An Arsenal spokesman said: “We are aware of an incident that occurred during our game against Manchester United on Sunday. The Metropolitan Police are conducting an investigation into the matter and we are cooperating fully with their inquiries.”
https://www.standard.co.uk/sport/football/roy-keane-police-investigating-alleged-headbutt-arsenal-man-utd-assault-b1104587.html Roy Keane: Police are investigating an alleged headbutt against the Manchester United legend during an Arsenal game