As Nick Kyrgios was announcing his withdrawal from the Australian Open, his physiotherapist flagged the tennis star had "some pretty gruesome photos" from a surgical procedure on his injured knee.

WARNING: This story contains images some readers may find disturbing.

Knowing Kyrgios's penchant for posting to social media, physio Will Maher said: "I'm sure he'll probably share them later."

And share them he has, mere hours after Australia's top-ranked player made the miserable announcement that he would miss his home major.

"I'm devastated, obviously. It's like my home tournament. I've had some great memories here.

"Obviously, last year winning the title in doubles and playing the best tennis of my life probably, then going into this event as one of the favourites, it's brutal."

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Duration: 2 minutes 6 seconds2m 6s

Fair warning, the photo Kyrgios shared on his Instagram stories is not fo faint hearts or weak stomachs, so — and we don't advise this often — but here is your chance to close this window.

…

OK. If you are still here, you're ready to see something nasty.

Ready? OK.

Yep. You can't say you weren't warned.

According to Kyrgios, that is "a little insight into what was in [his] knee" that was removed during a fenestration and drainage procedure.