Thomas Tuchel has criticised the referee for "smiling and laughing" with Real Madrid boss Carlo Ancelotti after Chelsea's Champions League exit.
Tuchel said he was disappointed Szymon Marciniak appeared to be having "a good time with Carlo" at the final whistle.
Trailing 3-1 from the first leg, the Blues forced extra time against the record 13-time winners at the Bernabeu before losing 5-4 on aggregate.
"I think this is the very, very worst time to do this," said Tuchel.
"After 126 minutes with one team giving their heart and desire, fighting to the very last drop.