Brazil's health regulator warned former Chelsea and Arsenal forward Willian that he must not attempt to make his debut for Corinthians on Sunday because he must quarantine after spending time in England.

Anvisa said on Saturday that Willian, who arrived at the Sao Paulo club 10 days ago, agreed on entering Brazil to quarantine for 14 days because he had come from England, where COVID-19 variants are considered a particular threat.

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The regulator said it had warned the club and the Brazilian Football Confederation, and had located the hotel were the Corinthians squad was based before Sunday's league game against Athletico Goianiense.

It has asked authorities to "adopt the necessary measures ... to avoid the player not complying with the quarantine period," Anvisa said in a statement.

The move comes even though Willian spent time last week training with his new club.

It also occurred almost a week after the same regulator forced Brazil's World Cup qualifier against Argentina to be abandoned after just five minutes due to the presence of four Argentines who had also been in England.

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Corinthians has not commented on Anvisa's decision.