In this Nov 5, 2021 file photo, Belinda Bencic of Switzerland reacts as she plays against Ajla Tomljanovic of Australia (not pictured) during the semi-final of the Billie Jean King Cup between Switzerland and Australia at the O2 Arena in Prague. (MICHAL CIZEK / AFP)

Olympic tennis champion Belinda Bencic and Tunisian Ons Jabeur have tested positive for COVID-19 following their trip to Abu Dhabi, both said on Tuesday, a day after Rafa Nadal announced he had also tested positive.

Both Bencic and Jabeur said they were fully vaccinated and were experiencing strong symptoms

Bencic, Jabuer and Nadal had travelled to Abu Dhabi to play in the Mubadala World Tennis Championship exhibition event last week.

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Bencic lost to Jabeur, who had replaced US Open champion Emma Raducanu after the Briton tested positive for COVID-19 and withdrew from the event.

Both Bencic and Jabeur said they were fully vaccinated and were experiencing strong symptoms.

"I am currently isolating and taking all precautionary (measures) to get through this as best as possible as I am experiencing quite severe symptoms (fever, aches, chills)," Bencic said on Twitter.

"While the timing is not ideal - as I was in the final stages of my preparations for the Australian Open swing - I will make my way to Australia as soon as I am cleared and past the isolation period."

READ MORE: Nadal tests positive for COVID-19 after Abu Dhabi comeback

In this Oct 15, 2021 file photo, Ons Jabeur of Tunisia hits a forehand return to Paula Badosa of Spain during their semifinal match at the ATP-WTA Indian Wells tennis tournament in Indian Wells, California. (FREDERIC J BROWN / AFP)

The Australian Open begins on Jan 17.

Bencic said she is isolating in Tunisia.

Earlier, Nadal also said he was having some "unpleasant moments" after testing positive upon his return to Spain.