Chelsea missed a golden opportunity to take control of the top four race on Monday night by drawing 2-2 at home to Burnley.Arsenal, Tottenham and Manchester United all losing over the weekend meant the Blues could have moved up to third and two points clear of fourth.But early goals from N'Golo Kante and Gonzalo Higuain were cancelled out by Jeff Hendrick and Ashley Barnes' strikes. Burnley actually went 1-0 ahead at Stamford Bridge.Frustrations boiled over at full-time, too, following Maurizio Sarri's red card for an incident involving the away side's bench.Antonio Rudiger had to be separated from Burnley goalkeeping coach Billy Mercer, who had been arguing with Chelsea's Massimo Nenci and Paolo Bertelli.And according to ESPN sources, it all started because Sarri was called a "s**t Italian" by several members of Burnley's staff.Chelsea are set to report the abuse to the Football Association, who may want to take action against the Clarets.Assistant manager Gianfranco Zola explained the situation in a post-match press conference after Sarri refused to address the media due to feeling "offended"."The reason [for Sarri not appearing] is he's very frustrated, so he'd prefer not to come over here," said Zola. "He's been sent off."I think he's been offended as well, so he didn't feel it was the right thing to do, to speak to you. I know you wanted him, so I'm sorry."But you can understand: he's frustrated at the game, frustrated at being sent off, and the other thing. He'd prefer not to come in.

"I think he's been told something from their bench, but don't ask me exactly what. I don't want to go down that line, but we'll see what we can do about that.

"I think there will be a follow [up] on that. Maurizio felt very unhappy. We understand it's a football game.

"You say words because of the adrenalin, but he wasn't particularly happy. If Maurizio said that, probably it's something that could have been avoided."