Moeen Ali has tested positive for coronavirus upon arrival in Sri Lanka, the England and Wales Cricket Board (ECB) has announced.
Ali and the rest of the England Test squad were checked at the airport in Hambantota on Sunday after flying in ahead of the two-match series, which gets underway on January 14.
The all-rounder will now observe a 10-day period of self-isolation, while team-mate Chris Woakes will isolate for a minimum of seven days after being deemed a possible close contact.
Further testing of the rest of the party will be carried out on Tuesday, with England's players then due to begin training the following day.
"Ali will now observe a period of 10-days self-isolation, in accordance with the Sri Lanka government's protocol on quarantine," a statement from the ECB read.
"Chris Woakes has been deemed as a possible close contact, and he will observe a period of self-isolation and further testing.
"The touring party will be PCR tested for a second time on Tuesday morning. At this stage, the team will train for the first time on Wednesday."
England selected a 16-man squad for the series in Sri Lanka, though seven reserves were also announced for the trip to help cover for potential absences.
The white-ball tour to South Africa in December was cut short due to a number of COVID-19 cases within the bubble shared by the two teams.
While the three-match Twenty20 series against the Proteas was completed, the one-day games scheduled had to be cancelled.