(CNN) -- Rafael Nadal has pulled out of this week's Paris Masters but insists he will be fit to take part in the season-ending ATP World Tour finals in London.
The world number one is suffering from tendinitis in his shoulder and has been ordered to combine rest with intensive treatment for seven days until he can return to practice.
The 24-year-old Spaniard has enjoyed a hugely successful year, winning at the French Open and Wimbledon, before completing a career Grand Slam with victory at the U.S. Open.
Nadal has also claimed a three further titles on the ATP Tour and will end the year as the top ranked player, but he says he dropped out of the Paris tournament with a heavy heart.
"For sure, for me it is disappointing not to be here," he told the ATP Tour website. "It is the last Masters 1000 of the year, and for sure one of my favorites of the world. So it was not easy decision.
"This injury is not a big problem, but I have to be careful, because if I had an injury now it could be difficult to play London and to play well in the beginning of the season next year. I'm not worried about London."
Nadal wants to be in top shape for the Tour finals, that start on November 21, and make up for a disappointing showing last year where he suffered with injuries and lost all three of his round robin matches.
"I'm going to be with special motivation and I'm going do all in my hands to play well there," said Nadal.
"It is a goal for me to try to improve the image of last year in London. I think I am focused to try to do this. We will see what happens, I am focused on trying to play well there.
"It is probably the most difficult surface against the most difficult opponents for me, so probably is the more difficult tournament for me to win during the year. But I am here to try."
Elsewhere, Andy and Jamie Murray claimed their first ever doubles title with victory at the Valencia Open 500 Sunday.
The pair beat Mahesh Bhupathi and Max Mirnyi 7-6 5-7 10-7 just over a week after Andy acted as Jamie's best men at his wedding to Colombian Alejandra Gutierrez in Scotland.
"It was a great week, it's the first time me and Jamie have ever won a tournament together. One of the best wins of my career, that's for sure," Andy told the ATP Tour website.
Jamie added: "Obviously I got married last week and then I had the chance to come here with Andy and play a big tournament here. We made the most of it and it was well worth it. I had a great time all week playing with Andy."