Undisputed middleweight champion Gennady Golovkin has described his big rival Canelo Alvarez as 'the largest problem we have in boxing'.

Ever since the controversial draw between the pair last year, in a bout Golovkin, along with the vast majority who watched the fight, was convinced he’d won, a rematch has been on the cards.

It had been set for this weekend in Las Vegas, but after Canelo failed a drug test, the fight was postponed.

In an interview with ESPN, the man known as Triple GGG said of Canelo: "He's a dirty fighter because he was caught doping and that's why we shouldn't spend too much time talking about him. He's a problem we have in boxing."

He also added the rematch may now be in doubt.

"Knowing that, and knowing other things about the other side, there is a question mark about whether there will be a fight in September or not.

"I have nothing to hide, but I don't see any willingness from the other side to offer some fair conditions. Maybe they will do it later, but at this point, no.

"There are other good fighters, maybe not as good financially, but Canelo is not the only option. There are some other boxers who should be given a chance. Let's not only talk about Canelo."

Canelo tested positive for the banned substance clenbuterol, but claims it was picked up eating contaminated meat during a trip back to his homeland Mexico.

He insists he’s a clean fighter and did pass two further drug tests taken in the build-up to this rematch.

It now remains to be seen if the two fighters can set aside all these issues and get the rematch to happen later this year.

Triple GGG seems to want to take the focus away from Canelo, however, and move on with his career in other directions.

The Kazakhstan superstar will now defend his titles against replacement Vanes Martirosyan on the original bill this weekend.