Defending champion Novak Djokovic has withdrawn from the French Open before his quarter-final with a knee injury.

Serbia’s Djokovic had a scan for the injury on Tuesday, having blamed the "slippery" Roland Garros clay courts for aggravating the problem during his fourth-round victory on Monday.

The top seed announced his withdrawal from the Grand Slam tournament later on Tuesday.

The 37-year-old was due to play Norwegian seventh seed Casper Ruud in the last eight on Wednesday.

The scan revealed Djokovic has a "torn medial meniscus" in his right knee, said French Open organisers.

The injury has ended his hopes of winning a 25th Grand Slam title - which would be an outright all-time record - on the Paris clay.

As a result of withdrawing, Djokovic will lose his status as the world number one and be replaced by Italy’s Jannik Sinner after the French Open.