Swiss tennis star Roger Federer hasn't played in a tournament since last season's Wimbledon, which saw him bow out in the quarterfinals. The 20-time Grand Slam champion is recovering from knee surgery, which has cast some serious doubt on his potential participation in the 2022 grass court slam. Federer, 40, is nearing the end of his storied career, though there remains hope that he'll be able to take the court at Wimbledon in 2022. One of his coaches, Severan Luthi, offered a grim forecast on Federer's Wimbledon hopes, as reported by Yahoo Sport.

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“At the moment, I don't envisage him playing Wimbledon,” Luthi told German publication Tages Anseiger.

He's still in the rehabilitation phase. Not only do the knee and leg muscles have to be built up, the whole body has to be strengthened. It's a full conditioning program,” Luthi added.

Coming from one of Roger Federer's coaches, this doesn't sound too encouraging when it comes to his chances of taking the court at Wimbledon in 2022. Federer, per Luthi, is still in the “rehabilitation phase” following his knee surgery.

That means that Federer has to rebuild the leg muscles while working on his conditioning. With Wimbledon set to begin in late June, that doesn't leave a whole lot of time for the 40-year-old to prepare his body.

Tennis fans have long hoped that Federer would be able to secure one last Grand Slam before he bids the game farewell. Wimbledon remains his best chance of doing that, though it's becoming increasingly likely that he doesn't make an appearance at the tournament in 2022.