Former two division world champion David Haye (28-3, 26 KOs), 37 years old, admits that his career could come to a close by the end of the year.

Haye has been out of the ring since last March, when he suffered a shocking TKO defeat at the hands of Tony Bellew at the O2 Arena in London.

He is currently training for their scheduled rematch, set to take place on May 5th at the same venue.

In the first bout, Haye was doing well in the fight but everything changed when his Achilles burst and then Bellew took over the entire contest, scored two knockdowns and eventually he secured the TKO win in the eleventh.

Haye underwent surgery that kept him on the shelf for most of the year.

A rematch with Bellew was initially scheduled for December 17, but it was pushed back after Haye sustaining a torn bicep in training - and one again had surgery.

Bellew was the third fight in Haye's comeback, which began in January 2016 after being away from the ring since July of 2012, when he knocked out Dereck Chisora in five rounds.

According to Haye, his injury is healing up very well and he expects to be fully fit for the second meeting.

"It's just gone six weeks since I had my bicep surgery and the scar is healing well, all the tissue inside seems to healing," Haye said.

"It's about 40 percent back to where I want it to be, but after six weeks that's a good place to be and give it another month I will be punching at full throttle. Everything is where it needs to be. My career and legacy on the line.

"I'm happy and I'm working, I'm feeling good. 2018 is going to be an entertaining year, potentially my last year as a competitive athlete so I want to go out with some big fireworks."