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The two-time winner was forced to retire from his second-round match at the Queen's Championships against Australia's Jordan Thompson after just five games.

It was later revealed by the 37-year-old that he had been suffering with back pain which eventually spread to his right leg, forcing him to withdraw from the competition.

The two-time Olympic gold medal winner is set to call time on his illustrious career later this year, with Wimbledon and the Paris 2024 Olympic Games described as a fitting end to the Briton's 20-year spell on the court.

But the former world No.1 faces a race against time to fit for Wimbledon, which starts on 1 July, where he is also set to feature in the men's doubles with his older brother, Jamie.

“He saw a specialist yesterday evening and he’s basically trying to decide what his next move is," his brother told the BBC.

"I don’t think it’s right for me to go into that personally, that’s up to him, but I think he has got a few decisions to make.

"It’s obviously incredibly disappointing for him that this was potentially going to be his last Queen’s, last Wimbledon and Olympics, and there’s a potential that that might not be able to happen.

"I think he’s got to make a few decisions, and see where he goes from there.”