Three members of the Pakistan squad due to tour England this summer have tested positive for coronavirus.
Batsman Haider Ali, 19, fast bowler Haris Rauf, 26, and spinner Shadab Khan, 21, were all asymptomatic but tested positive on Sunday.
Pakistan are due to fly to England on 28 June for three Tests and three Twenty20s in August and September.
It has not been confirmed whether the trio will be removed from the squad but they have been told to self-isolate.
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The positive tests came in a round of testing for the squad before the tour, with two other players - Imad Wasim and Usman Shinwari - returning negative results.
The remainder of the 29-man squad's test results are expected on Tuesday.
Four players - Bilal Asif, Imran Butt, Musa Khan and Mohammad Nawaz - had been named as reserves for the squad in case a player tested positive.
England are currently preparing to face West Indies in a three-match Test series starting on 8 July with the tourists currently quarantining at Emirates Old Trafford.