Chelsea's full squad have gone into self-isolation after winger Callum Hudson-Odoi tested positive for the coronavirus, the club said in a statement.
Hudson-Odoi displayed cold symptoms on Monday morning and has stayed away from the club since then. His test result was returned on Thursday night.
The club said: "Chelsea personnel who had recent close contact with the player in the men's team building will now self-isolate in line with Government health guidelines. These will include initially the full men's team squad, coaching staff and a number of backroom staff."
The club said despite testing positive, the 19-year-old was "doing well and looking forward to returning to the training ground as soon as it is possible".
The Blues have also closed two buildings at their training facility.
Chelsea pre-match news conference before their Premier League game at Aston Villa that was scheduled for Friday was cancelled.
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Mason Mount, second left, celebrates scoring Chelsea's first goal in their 4-0 victory against Everton at Stamford Bridge on Sunday. Reuters -
Everton goalkeeper Jordan Pickford is beaten by Mason Mount's shot that put Chelsea 1-0 up. Reuters -
Everton's Dominic Calvert-Lewin after missing a chance. Reuters. -
Everton manager Carlo Ancelotti. Reuters -
Olivier Giroud of Chelsea. Getty -
Pedro celebrates scoring Chelsea's second. Getty -
Billy Gilmour of Chelsea. Getty -
Pedro scores Chelsea's second goal. Getty -
Chelsea manager Frank Lampard celebrates after the match. Reuters -
Chelsea's Ross Barkley surges past Tom Davies and Gylfi Sigurdsson of Everton. Reuters -
Everton goalkeeper Jordan Pickford after Chelsea's third goal scored by Willian. Reuters -
Chelsea's Willian celebrates after scoring his side's third goal. AP -
Referee Kevin Friend pats Chelsea goalkeeper Kepa Arrizabalaga on the head. Getty -
Olivier Giroud slides in to score Chelsea's fourth goal. Getty -
Everton's Djibril Sidibe tackles Tino Anjorin of Chelsea. AFP
