Novak Djokovic withdrew from the French Open ahead of his quarter-final against Casper Ruud due to a knee injury suffered in the previous round, tournament organisers announced on Tuesday.

"Due to a torn medial meniscus in his right knee (discovered during an MRI scan performed today), Novak Djokovic... has been forced to withdraw from the Roland Garros tournament," organisers said in a statement.

World number one and 24-time Grand Slam champion Djokovic was due to play Ruud on Wednesday for a place in the last four. Djokovic defeated Ruud in last year's final at Roland Garros.

The 37-year-old Djokovic had cast doubt over his fitness following Monday's five-set win over Francisco Cerundolo, admitting he needed anti-inflammatory drugs to get through the match.

Djokovic blamed the "slippery" Philippe Chatrier court for the injury he sustained early in the second set of his 6-1, 5-7, 3-6, 7-5, 6-3 victory over Cerundolo.

"I don't know what will happen tomorrow or after tomorrow if I'll be able to step out on the court and play. You know, I hope so. Let's see what happens," Djokovic said after the match.