Middlesbrough will be without "50%" of their usual first-team squad for Saturday's FA Cup tie at Brentford, says boss Neil Warnock.
The Teessiders tested earlier than required to give themselves time to respond to positive tests and self-isolated players accordingly this week.
Boro's squad will be made up of under-23 and first-team players, depending on a second round of Covid-19 testing.
"I love the FA Cup, Brentford's a great place to go to," said Warnock.
"I don't want to just throw the tie away - I want to play as strong as side as I can.