North Sea operator CNOOC is working to tackle a Covid outbreak on board its Scott platform.
At least three people on board are confirmed to have contracted the virus, while around 10 others are being quarantined, according to two sources.
CNOOC has been asked to comment.
It is understood that Covid testing is being arranged for workers remaining on board the CNOOC installation, which lies around 115miles north-east of Aberdeen in the North Sea.
It comes amid further cases of the virus on board UK installations since the start of the month.
An outbreak took place on board the Ithaca Energy FPF-1 installation last week, where four people contracted the virus and several others were quarantined.
That figure has now risen to 17, according to the Health and Safety Executive (HSE).
The incident saw the shut down of the installation while Ithaca went to minumum manning, carried out a deep clean, and implemented testing for workers on board.
Ithaca said last week that it would not increase manning levels until it was safe to do so.
Last week also saw the removal of two workers from the Apache Forties Bravo.
Both firms said they were committed to the safety of their employees as they worked to handle the incidents.
On the Norwegian side, an outbreak took place on the Rowan Stavanger earlier this month, but operator Valaris did not make any comment following the incident which saw at least 15 workers airlifted to shore.
The UK as a whole has recorded 22,195 daily cases of Covid over the last 24 hours, while Scotland alone reported 752 cases.
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