All hell broke loose when Everton hosted Lyon for a Europa League match on Thursday. "This will include a ban from attending future Everton fixtures and the Club registering a formal complaint with Merseyside Police".
Anthony Lopes suggests that the second-half fracas in Lyon's meeting with Everton was a good thing as it "woke up the home fans".
Detectives will be reviewing footage and speaking to witnesses to establish what, if any, offences have been committed.
Merseyside Police confirmed that they are investigating the incident, which has seen Everton charged by UEFA for "aggression by supporters against players".
Both sets of players came face to face near the barriers at the Howard Kendall Gwladys Street End, with one supporter - clutching a child in his arms - appearing to lash out at the visiting keeper.
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"I still believe in the players and signings in the summer".
He added: "His personal situation, it was hard after (being knocked) out of the World (Cup following the qualifiers) with Wales".
While that was occurring, Williams seemed to raise his hand to Lucas Tousart's face, yet the only initial outcome of the skirmish was a booking for Everton's captain-for-the-night and Lyon's match-winner Bertrand Traore.
"The fact that a couple of Everton backroom staff had to enter the field to calm Williams down showed how out of control the captain was and, while their intervention helped, they should not enter the field of play".
The loss increases scrutiny of Koeman, whose team sit bottom of their group with no wins in three Europa League games.
He added: "If you look back to last season, we had good games at home against big teams in the Premier League".