"It is true that we had detected for some time and occasionally bothered me".
With Nadal out of competitive tennis for the rest of the year, Novak Djokovic is assured of ending the season on top of the world rankings. I played at a very high level when I was able to compete, but at the same time it was very bad as far as injuries are concerned.
The 31-year-old from Serbia was No.22 as late as June after beginning the year with a 6-6 record while recovering from surgery on his right elbow.
The issue was serious enough to also rule Nadal out of the Masters 1000 events in Indian Wells and Miami, but he went on to enjoy familiar success on clay, including yet another French Open title.
"What Novak has achieved this season has to go down as one of the great sporting comebacks".
He was forced to retire mid-way through his US Open semi-final with Juan Martin Del Potro in September due to pain in his right knee and has not been able to play a competitive match since.
Abdominal problems had seen Nadal pull out of the Paris Masters last week and while they continued to hinder him, the Spaniard also revealed he needed an operation to remove a "free body" from his ankle.
The 17-time Grand Slam champion was set to make his comeback from a two-month absence at last week's Paris Masters but withdrew, citing an abdominal strain, but had hoped to feature in the season finale.
Novak Djokovic of Serbia shouts during the final match of the Paris Masters tennis tournament against Karen Khachanov of Russian Federation at the Bercy Arena in Paris, France, Sunday, Nov. 4, 2018.