MotoGP has been operating tight restrictions to quell the spread of COVID-19, though it has recorded several cases from paddock members – including Moto2 rider Jorge Martin, who had to miss last month’s Misano double-header after catching the illness.
Rossi confirmed on his Instagram feed that he woke up feeling unwell at Aragon and underwent a test for COVID-19, which came back negative.
However, a second test produced a positive result and he will now miss this weekend’s Aragon GP and likely the second Aragon event next week.
He has been self-isolating since his arrival to Aragon and expressed his disappointment having done “my best to respect the protocol”.
“Unfortunately this morning I woke up and I was not feeling good,” Rossi posted on social media.
“My bones were sore and I had a slight fever, so I immediately called the doctor who tested me twice.
“The ‘quick PCR test’ result was negative, just like the test I underwent on Tuesday.
“But the second one, of which the result was sent to me at 4pm this afternoon, was unfortunately positive.
“I am so disappointed that I will have to miss the race at Aragon.
“I’d like to be optimistic and confident, but I expect the second round in Aragon to be a no go for me as well.
“I am sad and angry because I did my best to respect the protocol, and although the test I had on Tuesday was negative, I self-isolated since my arrival from Le Mans.
“Anyway, this is the way it is and I can’t do anything to change the situation. I will now follow the medical advice and I just hope I will be feeling well soon.”
Yamaha is yet to make an official announcement.