The former Chelsea manager went over to Conte at the final whistle and appeared to berate him for pumping up the home fans.
Mourinho was caught on camera shouting in the Italian’s ear before storming off down the tunnel before Conte could even reply to the accusations.
Conte was riling the crowd after the third goal and was seen clapping along with them as they chanted towards the end of the game and the Man United boss was reportedly unhappy with his celebrations.
Chelsea took only 33 seconds to take the lead in Mourinho’s return as Pedro made the most of Chris Smalling’s slow reactions to round David De Gea and finish into an empty net.
Gary Cahill doubled the lead before half time after Smalling was again caught napping at a corner, before Eden Hazard added a third with 30 minutes still remaining.
Summer signing N’Golo Kante then wrapped up the victory with his first goal for the club since moving from Leicester as the Blues moved within one point of the Premier League summit.
United, on the other hand, end the weekend in seventh position, with 14 points from their opening nine games – the same number of points David Moyes had at this stage during his only season in charge.
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