Nick Kyrgios reveals injury battle, vows to regain fitness before Australian Open

Nick Kyrgios has revealed an injury battle as he flies home to Australia in the hope of getting fit to compete at the Open in Melbourne in January.

After losing his fifth consecutive singles match - to Stefanos Tsitsipas at the Laver Cup over the weekend - the Canberra product dropped a bombshell in conceding his career as a professional player may be coming to an end.

Kyrgios also revealed his mother is ill and he would finish his 2021 season to return to Australia's capital and spend time with her, before resuming training.

On Tuesday, however, Kyrgios lifted the lid on an injury which he says has been hampering him for some time.

"Over the last couple months I haven't been near 100 per cent healthy," he wrote in an Instagram story post.

"I've been dealing with left knee patella tendonopathy and continuing to play without fully treating it can lead to further pain and greater setbacks.

"I've chosen to fly back to Australia to reassess and am planning to get PRP treatment to settle down and rehab my knee.

"I'm disappointed it has kept me from playing my best tennis and hopefully with everything going smoothly I'll be back to 100 per cent by the Australian Open."

The 26-year-old will be hoping to be fit and firing in time for the Australian Open in January.