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Willian and other Chelsea players were forced to go into self-isolation after Chelsea team-mate Callum Hudson-Odoi tested positive for coronavirus in March.
Willian has now admitted he was worried he may have caught the virus from Hudson-Odoi.
“We shook hands and hugged each other,” Willian told AP.
“So after that when he tested positive for the coronavirus I think everyone was worried about it. But none of us felt any symptoms.”