A Norwich City player announced as testing positive for the coronavirus featured in a practice game at Tottenham the previous day ahead of the English Premier League resuming.
The unidentified player was one of two new Covid-19 cases detected after 1,200 people were tested at the 20 clubs on Thursday and Friday.
The league releases only anonymous data and no other club disclosed a positive test on Saturday.
Players and club staff are being tested twice a week across the league, which ends its pandemic-enforced 100-day
shutdown on Wednesday in empty stadiums.
The Norwich player will not be available for his team’s restart game against Southampton on Friday as he has to self-isolate for seven days and then return a negative test before resuming training.
“The club will not name the player in question and asks that his request for privacy and confidentiality are respected at this time,” Norwich said.
Tottenham said none of its squad must self-isolate because the Norwich player said he was not in close contact with the squad for long enough.