The 42-year-old man has been detained on suspicion of assault.

Footage circulating on social media appeared to show the aftermath of an incident involving Keane and fellow pundit Micah Richards following Arsenal's win over Manchester United.

Sky Sports confirmed the incident saying that Richards attempted to "defuse" the situation, adding the alleged assault immediately preceded the footage on social media.

Both Keane and Richards have given statements to the Met Police.

The alleged incident took place after Arsenal triumphed 3-1 over Manchester United.

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In an earlier statement the Metropolitan Police had said: "Police are investigating following an assault that is alleged to have occurred at the Emirates Stadium during an Arsenal v Manchester United match on Sunday 3 September.

"Inquiries are ongoing."