Ollie Robinson is among seven Sussex players self-isolating following a positive Covid-19 test for an eighth, the 20-year-old top-order batter Tom Clark.
Clark, who has played seven of Sussex's eight County Championship fixtures this season, tested positive on Tuesday and has entered self-isolation. Seven other squad members and an unnamed member of support staff were identified as "having had close contact" with Clark in the 48 hours before the onset of his symptoms.
Robinson, who has played two T20 Blast games in the last week following his indefinite suspension from international cricket pending an investigation into historic tweets and a short break from all cricket, is one of the seven, along with Jamie Atkins, James Coles, Henry Crocombe, Tom Haines, Sean Hunt and Delray Rawlins.
Only Rawlins and Robinson are first-choice players in the T20 Blast, though Crocombe has made one appearance and had been named in the squad for Tuesday night's fixture against Kent, which was abandoned two hours before the scheduled 7pm local start time because of a wet outfield. It was a fifth abandonment in the competition for Sussex this season.
With both sides picking up one point Kent moved above Gloucestershire into top spot and Sussex sat in third place.
The news follows players missing games through either positive tests or track-and-trace requirements at Durham, Glamorgan, Middlesex, Nottinghamshire and Surrey earlier this season, while Hampshire, Northamptonshire and Yorkshire were all affected in 2020.
Meanwhile, Sussex have announced that Rashid Khan is only likely to play two Blast group games this season. Khan was due to spend the full season at the club but withdrew from the start of the group stage to play in the rescheduled PSL for Lahore Qalandars.
He will arrive in the UK on Thursday from the UAE, which is on the UK government's red list for travel, meaning he will have to spend 10 days in hotel-room quarantine. As a result, he is only due to be available for the final two group games, against Hampshire and Kent on July 16 and 18. He will then stay in the UK to play for Trent Rockets in the Hundred.