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Middleweight king Gennady Golovkin has warned Saul 'Canelo' Alvarez could be his last fight as a professional.

'GGG' will box 'Canelo' on September 16, live on BoxNation, for the right to be called the No.1 middleweight in the world and, in all likelihood, pound-for-pound supremacy in the eyes of many fans.

The Kazakh bruiser went without wider recognition for most of his career but high-profile wins over Kell Brook and Daniel Jacobs have now established him as a pay-per-view fighter. But at 35 years of age, Golovkin is unsure how much longer he will fight for.

"I don't know [how long I will fight on for]," Golovkin admitted. "Maybe after this fight I'm finished, maybe not.

"I feel very good. OK, I'm 35 but I feel like I'm 25. But this is boxing, not soccer, it's not a game, this is a fight and every fight is very difficult."

(Image: Getty Images North America) (Image: Action Images via Reuters) (Image: Getty Images North America)

Having waited so many years to receive recognition as a fighter with elite skills as well as devastating power, Golovkin is clearly enjoying the limelight.

A knockout ratio of 89 percent makes a crushing defeat for Canelo feasible though and with it a conclusive answer to who is the No.1 middleweight in the world.

(Image: REUTERS) (Image: REUTERS)

But GGG is hoping to be pushed close and for a famous trilogy to develop and therefore cement his place alongside legendary middleweights such as Sugar Ray Robinson, Harry Greb, Carlos Monzon and Marvin Hagler,

Golovkin claim: "I'm ready [for a potential trilogy vs Canelo], I want. I believe it's possible."