Nadal hopes to play at Wimbledon World number one Rafael Nadal says he will give "200%" as he bids to be fit in time to defend his Wimbledon title.
The 22-year-old pulled out of Queen's with knee trouble and has been undergoing tests in Barcelona.
"I will give 200% to be at 100% for the most important date in world tennis," said Nadal in a statement on Tuesday.
The Spaniard, who beat Roger Federer in a classic final in 2008, will now undergo intense rehabilitation ahead of the start of Wimbledon on 22 June.
"I will not go out and play on any court, let alone Centre Court at Wimbledon, if I am not 100%," said Nadal.
"I have two difficult weeks ahead of me, especially because I won't be doing what I like doing most, which is to play tennis.
"I will be working on my recovery through physiotherapy treatments as well as recovery work on the specific muscular area."
Nadal plans to travel to London on 16 June.
The world number one has been suffering ongoing problems with both of his knees and he admitted he had been playing through the pain over recent months.
"The pain was limiting certain movements in my body, which affected me mentally as well," he said.
His unexpectedly early exit from the French Open, where he was beaten in the fourth round by Robin Soderling, allowed him to travel to Barcelona to investigate the problem.
He has been diagnosed with tendonitis in both quadricep tendons as well as a small amount of fluid on the kneecaps.
Nadal defeated his great rival Federer in a five-set epic last year to add the Wimbledon trophy to his four French Open titles.
He went on to topple Federer as world number one, winning a total of eight titles in 2008 including Olympic gold in Beijing.
Federer, who took advantage of Nadal's early elimination to win the French Open on Sunday to equal Pete Sampras's record of 14 Grand Slam titles, says the prospect of Nadal pulling out of Wimbledon is "frightening".
"I don't like to see it, because you want the best to be playing in the biggest events," said the Swiss.
"I only wish him the best and I hope it's not true that he will miss Wimbledon."