A chronic hip injury threatens to cruel Nick Kyrgios’s Wimbledon campaign before it even begins.

Australia’s top title hope has revealed he is not even three-quarters fit ahead of his tournament opener on Monday against Frenchman Pierre-Hugues Herbert.

“Probably 60, 65 per cent,” he said glumly after pulling up sore from his second win in three days at an exhibition event in Buckinghamshire.

“It’s not great. I played a couple of matches at Boodles the last couple of days to see where I was at and it’s definitely not 100 per cent.

“But I’m still going to obviously feel confident on the grass. I can serve well and still be successful but, at the same time, it’s not where I’d like my body to be.”

The injury – which he said affects “virtually everything” in his game – has been troubling the world No.20 since before he retired hurt midway through his third-round match at last year’s US Open.

It also undermined his French Open campaign.

“I didn’t play hard at all at the Boodles,” Kyrgios said.

“I think that’s why I wanted to play there. It’s a very controlled environment. Both players sort of know you just want to feel the ball, you don’t want to go too hard.

“I’ll be doing absolutely everything I can. I’ve been taking anti-inflammatories, doing an hour and a half of rehab every day, getting treatment.

“But there’s only so much treatment I can do with type of injury. It needs time to rest.

“I was in a good place before Queen’s. I got an injection after Paris, took 10 days off, rehabbed it and then slipped on the grass in Queen’s, which kind of screwed everything up.”

The 22-year-old admits long-term he will probably require surgery, as Lleyton Hewitt and Bernard Tomic have had to repair similar hip flexor issues.

“But you can avoid it if you do the right things,” he said.

“I was doing everything perfect after Paris. I was in the right spot. I wasn’t feeling it at all.”