Jose Mourinho found himself caught up in a touchline tussle on his return to Stamford Bridge as a member of Chelsea’s coaching staff celebrated a late leveller for the Blues in front of the Manchester United manager.
Marco Ianni, who is a second assistant to Maurizio Sarri, took great delight in seeing Ross Barkley snatch a 2-2 draw in stoppage-time.
He jumped off his seat upon seeing the ball hit the net and made a point of expressing his delight in front of Mourinho, who remained rooted to his bench.
Ianni swung a clenched fist in front of the Portuguese, who did not take kindly to being provoked at such an emotional moment.
Mourinho took off after his rival and had to be held back as a mass brawl broke out at the entrance to the Chelsea tunnel.
Backroom teams from both sides, along with security officials, were caught up in the tussle before players also got involved.
United’s manager was incensed and made his feelings clear to those in the opposing dugout.
Order was eventually restored, but there were further scuffles on the field before the full-time whistle went.
Mourinho had vowed to keep his cool heading into a highly-charged fixture, telling reporters: “Would I celebrate like crazy if my team score a goal at Stamford Bridge or my team wins at Stamford Bridge? I don’t think so.
“I think I would try to control myself and to respect the stadium and the supporters that were my supporters and stadium for many years, to do that should be something if I completely lost my emotional control, which is not easy.”