Manchester United and Manchester City were reportedly involved in a bust-up in the Old Trafford tunnel after the derby. Arsene Wenger has compared the situation to sumo-wrestling.
Arsene Wenger insists he will not allow Jack Wilshere, Olivier Giroud or Theo Walcott to leave in January. The trio have fallen out of favor at Arsenal.
Alexis Sanchez's contract at Arsenal expires at the end of the season, when he can leave the Emirates Stadium for free. Manchester City will reportedly bid for him in January.
Manchester United host Manchester City at Old Trafford on December 10 in the first Manchester derby of the season. Jose Mourinho believes Pep Guardiol has been fibbing over injuries.
Arsenal and Manchester City showed interest in signing Jonny Evans in the summer. Both are expected to make a bid in January but the new West Brom boss is eager for him to stay.
Arsenal is fourth in the Premier League table, 12 points behind leader Manchester City. But goalkeeper Petr Cech says the team can still win the league if it improves away form.
Manchester United travels to London on Saturday to face Arsenal in the Premier League. But Arsene Wenger is now set to be without his main striker Alexandre Lacazette.