Andre Agassi revealed some interesting things about Novak Djokovic's elbow injury. The former American player, who will help the Serb in 2018 said, 'He's done fantastic work in making sure he's over his injury once and for all, which was a fracture in the elbow,' Agassi told ESPN.

'We'll in a week from now if that's fully behind him, which is great. He's used the time [off tour] to train -- a lot.' There isn't so much time left for Djokovic, who plans to compete again in the first week of the 2018 season.

The next few weeks will be very important for him as he is expected to start training again. Agassi also spoke about the ATP Finals, which features Rafael Nadal and Roger Federer as the top two seeds. 'Historically, Rafa's end of the year is never quite the same as the middle or the beginning.

A lot of that goes into the wear and tear and the intensity that he brings to the table [in each match]. Who knows with Roger. In a lot of ways, he wasn't himself at the US Open and leading up to it. He's taken his time and has proven to be a person who takes pretty good decisions.

I do expect him to be at his best.' ALSO READ: Toni Nadal: 'Rafa plays better now. But Federer, Djokovic do too'