Diego Costa appeared to perform a bizarre joke mocking the recent outbreak of coronavirus after Atletico Madrid dumped Liverpool out of the Champions League on Wednesday.
Costa started the tie at Anfield and as he departed the stadium following the game was filmed coughing at reporters lined up in the media zone.
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Daily Mail journalist Dominic King wrote afterwards: "Nothing like humour... and that was nothing like humour from Diego Costa.
"Walks through mixed zone, ignores all requests from Spanish media for interviews then coughs - theatrically - repeatedly as he breezes past. He was the only who laughed."
PA's Carl Markham added: "Diego Costa just walked through the mixed zone fake coughing at everyone as he went down the line. Not particularly funny or appropriate."
All football games in England are soon set to be played behind closed doors according to recent reports.
