The PA news agency understands City are to check CCTV footage and blue seats appeared to be thrown after full-time as tempers frayed.

Asked about the incidents which came a day after United executive vice-chairman Ed Woodward's house was attacked, City boss Guardiola said: "I don't like it. I didn't know it.

"I don't like what happened with Ed Woodward at home because this is football.

"I am pretty sure you see the squad for United, it's really good. Honestly, it's really good so that is not the way to do it.

"When you talk about what happened, I didn't know it. If it would happen, that is not nice. Absolutely not."

Solskjaer echoed Guardiola's comments after his side's victory.

"I've just got to stand behind Pep there," he said.

"You know, football is a game. It's a game we should all enjoy – spectators, the ones who watch it on telly, the ones playing.

"I keep telling the players every time 'go out with a big smile and enjoy yourselves'. Work hard, yes, and fans should always try to enjoy the games

"Yeah, we want rivalry but let's keep it at a sane level and let's make sure we eradicate that now.

"So, yeah, I stand behind Pep there and I think all of us do. We want to make this a nice game."