ROY Keane was left "shaken" after he was allegedly headbutted by a fan during the Arsenal and Manchester United game.
Micah Richards was seen pinning a man against a wall during a confrontation inside the Emirates Stadium yesterday.
A man, 42, has since been arrested on suspicion of assault.
Both pundits were left shaken following the incident, Sun Sport understands.
Sky is also understood to be beefing up its security moving forward.
The fan, meanwhile, fled the scene in a crowd with police and Arsenal now combing through CCTV footage to find him.
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Keane and Richards had been waiting near a lift at the members-only Highbury Bar, at the top of the West Stand, when the incident took place.
They were making their way towards pitchside to give their post-match thoughts as part of Sky's coverage as the Premier League clash reached its final stages.
But the pundits began returning to the Sky studio to watch replays of Alejandro Garnacho's late goal for United, only for his strike to be later ruled out for offside.
A witness told The Express Keane was asking nearby staff to call police.
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They said: "The fan seemingly tried to headbutt Roy Keane. I then saw a mark between his eyebrows.
"Micah Richards stepped in and pushed the fan back against the door. I heard the altercation and I was shocked to see the individuals involved."
The witness added: "Afterwards, we noticed a small amount of blood on the floor on the route where the fan was led out. Seems like Micah Richards was acting as Roy Keane's bodyguard."
Richards is said to have been "acting to defuse a situation", a Sky Sports spokesperson said.
The fan was prevented from inflicting any serious damage on the United legend.
The pair were eventually escorted down to the pitch, where they gave their thoughts post-match with ex-Arsenal winger Theo Walcott and presenter Dave Jones.
Keane seemed assured as he gave his thoughts on the game, even joking with Arsenal midfielder Declan Rice over how his strike should have been deemed an own goal.
Arsenal are cooperating with authorities with the investigation underway.
A club spokesperson added: "We are aware of an incident that took place during our match against Manchester United on Sunday.
"The Metropolitan Police is conducting an investigation into the matter and we are fully cooperating with their enquiries."
A spokesperson for Sky Sports said: "We understand the police are investigating an alleged assault by a member of the public immediately preceding the footage circulating on social media.
"In the footage seen, Micah Richards was acting to defuse a situation."
Keane and Richards played for fierce rivals on the pitch, but have former an unlikely bond since the ex-City defender joined the Sky Sports punditry team.
They regularly work on Sky's Super Sunday programme and will likely be back on TV screens together after the international break on September 17.
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Arsenal ended up running out 3-1 winners thanks to injury time strikes from new-signing Declan Rice and substitute Gabriel Jesus.
Marcus Rashford had earlier given United the lead, before Martin Odegaard cancelled out his strike less than a minute later.
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