Former ref Howard Webb has slammed Manchester City striker Sergio Aguero's high challenge against David Luiz.
The 'tackle' sparked chaos at the Etihad as players from Chelsea and Manchester City clashed minutes before the end of Blues win.
Webb told BT Sport: “It's one that the FA will look at afterwards. There's so much going on, it's absolutely crazy at the end.
“I think City lose a bit of composure at losing this big important game. Sergio Aguero commits an awful stud-first tackle, it's not even a tackle really, it's just a flying attack on David Luiz.
“It's one the FA will look at as well, maybe even more than three matches for that one.
“And then you get Cesc Fabregas just putting his hand on Fernandinho's face in the aftermath.
“Not exactly a slap but we've said before when you put your hand into somebody's face you're running a big risk of a red card.
“Fernandinho then gets hold of Fabregas by the neck and throws him over the hoardings so he gets sent off as well.
“Iheanacho maybe throws an arm so all sorts going off at the end but one thing's for sure the actions of Sergio Aguero are totally unacceptable."