Everton reacted to the shocking scenes in Thursday's 2-1 Europa League defeat by banning the supporter - but they still face investigation over "aggressions by supporters against players". "This will include a ban from attending future Everton fixtures and the Club registering a formal complaint with Merseyside Police".
The force said its detectives would review footage and speak to witnesses to establish what, if any, offences had been committed.
The defender, who scored an equaliser for Everton minutes after the incident, and Lyon striker Bertrand Traore, who got the victor for his side, received yellow cards for their parts in the struggle.
The fan, holding a baby, appeared to throw a punch at a Lyon player.
UEFA are also likely to take action against Everton, but are now waiting on the referee's match report to be submitted before deciding on an angle of attack.
"It's high emotions. We want to win the game, they want to win the game and stuff happens".
He said: "He showed his face yesterday, he played well, hewas a captain on the pitch and of course in the situation of the brawl he needs to control himself".
Despite Everton having just eight points from eight matches in 16th place in the Premier League table, Koeman is confident his team can beat Arsenal. The Toffees found themselves a goal behind after just five minutes after Nabil Fekir coolly converted a penalty after full-back Fernando Marçal was clumsily taken out by Mason Holgate. "We took the decision to give some rest to players for Sunday and I think it's a great game to play".
"On one hand, I understand frustration and disappointment, because everybody was disappointed".