Jannik Sinner has reportedly been forced to delay his trip to the Olympics as he is suffering from a fever, prompting doubt over his ability to compete for Italy this summer.

The reigning Australian Open champion and world No. 1 was set to be one of the leading tennis names in Paris, but after being forced to leave the court with illness during his Wimbledon quarter-final defeat to Daniil Medvedev, once again is struggling just days away from the Olympics opening ceremony.

Italian outlet Ansa claim that Sinner will not leave for Paris today (Tuesday) as planned after picking up a fever. Many athletes are already in the Olympic Village and getting used to their accommodation between now and August 11, but Sinner has been forced to turn up later than planned.

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The 22-year-old is instead scheduled to fly to France on Thursday, the day of the draw for the tennis competitions, with opening matches scheduled for Saturday.

After he was forced to leave the court mid-match at SW19 before losing in five sets to Medvedev, Sinner explained that he had been dizzy on the grass and struggled all day.

“Already this morning I didn’t feel great. Had some problems. Then with the fatigue, it was tough,” Sinner said. “But nothing to take away from Daniil. I think he played very smart. He played good tennis. That’s it.

“I went off the court actually. I didn’t want to go off. The physio told me better to take some time because he watched me, and I didn’t seem in shape to play. I was struggling physically. It was not (an) easy moment. I tried to fight with what I had today. No, that’s it.

“Yeah, I was [ill]. I was not feeling great. I didn’t vomit. This, no. But took some time because I was dizzy quite a lot. Yeah, actually off court I had a little bit the toughest time maybe. When I went back, I tried my best.

“Obviously disappointed about the third set. Had (a) couple of set points. Couldn’t use them. Fourth set I raised my level a little bit. In the fifth I had just one poor service game, which decided the match.”

Sinner has not been in action since his Wimbledon defeat, prompting further concerns that he is not entering the Olympic draw in peak form or fitness.

The number one seed led Italy to the David Cup title and would have been full of confidence following a strong year culminating in his first appearance at the Games, but his campaign has been shrouded in doubt as a result of illness.