Chelsea manager Maurizio Sarri refused to shake counterpart Pep Guardiola's hand after his side were humiliated 6-0 by Manchester City at the on Sunday.
Chelsea suffered their biggest ever defeat in the Premier League as a Sergio Aguero hat-trick inspired Man City to climb to the top of the league table.
City scored four times inside 25 minutes and added two more goals in the second half to overtake Liverpool on goal difference at the top of the table.
After the game Sarri insisted that he "didn't see" Guardiola in that moment but would share pleasantries with his opposite number after the post-match interviews.
The result was Chelsea's heaviest defeat in any competition since losing 7-0 to Nottingham Forest in 1991.
"At the moment I am not able to explain," a dumbfounded Sarri told Sky Sports.