Arsenal manager Arsene Wenger has been asked by the Football Association (FA) to explain comments he made to the media on two separate occasions.
Wenger is already facing an FA charge for confronting the match officials following Arsenal's 1-1 draw with West Brom on December 31, although the Frenchman says he intends to contest the decision.
After referee Mike Dean controversially awarded a late penalty to West Brom for a handball against Calum Chambers, Wenger attacked the standard of refereeing in the Premier League, comparing it to the "dark ages".
Wenger was again unhappy with a penalty decision on Wednesday, when Anthony Taylor awarded a spot-kick after Hector Bellerin clumsily challenged Eden Hazard in the box during a 2-2 draw with Chelsea.
"It was a good game and overall I believe it could have gone both ways," he told Sky Sports. "We were first on the scoresheet and after that we again got a farcical decision.
"It's all opinions. But when your opinions go the same way, statistically, what is repeated is not a coincidence."
The FA has requested observations from Arsène Wenger for media comments he made on Tuesday [02/01/18] and after last night’s Arsenal versus Chelsea match [03/01/18]. He has until 6pm on Tuesday 9 January to respond.— FA Spokesperson (@FAspokesperson) January 4, 2018