The Spaniard has endured a poor autumn and appears in pain when he plays.
Rafael Nadal had earlier slammed the move claiming it goes against the values of the sport.
Rafael Nadal's season has been hampered by injuries and loss of form.
Nadal faces Troicki in the Shanghai Masters. Find out where to watch live in the UK.
Nadal faces Dimitrov in the quarter-final of the China Open. Find out where to watch live.
Nadal is a 14-time Grand Slam winner.
Djokovic has won 12 Grand Slam titles in his career.
Mats Wilander is a seven-time Grand Slam champion.
Hackers have released a fourth batch of medical documents.
Rafael Nadal's Spain will take on India in the Davis Cup tie to be held between 16 and 18 September in New Delhi.
India host Spain in the 2016 Davis Cup tie on 16 September.
India take on Spain in the world group play-off tie in the 2016 Davis Cup.
Rafael Nadal has not reached the quarter-final of a Grand Slam event for the first time in 12 years.
Rafael Nadal plays his fourth round match against Lucas Pouille on 4 September.
Rafael Nadal plays his third round match against Andrey Kuznetsov on 3 September.
Rafael Nadal plays his second round match against Andreas Seppi on 31 August.
Andy Murray won the US Open title in 2012.
Rafael Nadal won the US Open twice, in 2010 and 2013.
Djokovic will look to defend his US Open crown when he takes on Janowicz in the first round.
Federer and Nadal have won 31 Grand Slam titles between them.
The 17-time grand slam champion is set to team up with Rafael Nadal at the inaugural Laver Cup next year.
Rafael Nadal is currently ranked number five in the men's singles tennis rankings.