Frank Lampard took a blow to his pre-season plans with four Chelsea players testing positive for coronavirus last week.
The team returned to training on Monday after a slightly extended hiatus due to participation in both the FA Cup final and the Champions League round of 16, but last Friday they were tested at Cobham.
Players have mild symptoms or are asymptomatic and will return to training after spending seven days in isolation.
During the hiatus, players were allowed to go on vacation before starting preparations for what will be another grueling season.
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Chelsea will compete in the Champions League again during 2020/21 after finishing fourth in the Premier League.
The national season will begin on 14 September with a trip to Brighton and Hove Albion at the Amex Stadium.
The players in question will be available by then.
Chelsea will also face Brighton in a friendly match on Saturday, with the debuts of Timo Werner and Hakim Ziyech.
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Chelsea’s newest signing Ben Chilwell will miss out with a heel injury sustained at the end of last season.
England signed a five-year deal at Stamford Bridge on Wednesday with Chelsea which paid £ 50m.
Lampard will add veteran Brazilian center-back Thiago Silva, who is a free agent after leaving Paris Saint-Germain, and Bayer Leverkusen star Kai Havertz in the coming days.
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