Rafael Nadal has extended his long injury lay-off by another two months and will miss his country’s Davis Cup semi-final against the United States.

“Nadal will not play in the next two months and will stop to rest and recover his knee,” said an official statement from his home town of Manacor in Majorca, Spain.

“Among other things he won’t be able to be at the disposal of the Spanish Davis Cup captain for the semi-finals tie against the USA,” it said.

The French Open champion has been on the injury sidelines since his shock Wimbledon 2nd round exit at the hands of unheralded Lukas Rosol in late June.

That meant he missed the London Olympics, the Masters series events at Toronto and Cincinnati as well as the US Open which is currently underway in New York and where he reached the final last year.

Nadal has a torn tendon and inflammation in the left knee. The tear is being treated with medication, therapy and progressive rehabilitation, the player said.

“I really want to be back competing and enjoying the tennis tour but I have many years in front of me and my knee needs some rest,” the 26-year-old said.

The winner of the Spain-USA Davis Cup semi-final, which will be held in Gijon from September 14-16, will face either Argentina or the Czech Republic in November’s final.

A two-month lay-off will mean that Nadal will miss the rest of the ATP regular tour season.