In a video circulating on social media, Costa can be seen laughing and aiming coughs in the direction of reporters gathered in Anfield’s mixed zone.
The prank has drawn a mixed reaction but many have criticized the Spanish forward, including his club Ateltico.
“Obviously Diego’s actions were unfortunate and the club condemns his action,” Atletico told CNN in a statement.
“It’s a pity that some people find it difficult to understand the significance of this crisis. The player has repented and apologized when he realized his mistake.”
Gobert subsequently tested positive for coronavirus, while the NBA has postponed its season.
“I have gone through so many emotions since learning of my diagnosis … mostly fear, anxiety, and embarrassment,” wrote Gobert.
“The first and most important thing is I would like to publicly apologize to the people that I may have endangered. At the time, I had no idea I was even infected. I was careless and make no excuse.”