Chelsea boss Thomas Tuchel says player safety is at risk after his side were made to play their Premier League game against Wolverhampton Wanders on Sunday despite a Covid-19 outbreak.
Chelsea had just four outfield players on the bench as they drew 0-0 with Wolves.
"It is not safe," Tuchel told BBC Sport.
He added: "We talk about protecting players and a safe environment but it is not safe. I would be not surprised if the next test shows up and we have more positives.
"How should it stop if we sit in the bus and have dinners and just stay together like nothing happened?