Saul 'Canelo' Alvarez is set to announce a September trilogy fight against Gennadiy Golovkin, meaning his rematch with Dmitry Bivol must wait.

Alvarez suffered only the second defeat of his professional career against Bivol this month after stepping up to light heavyweight.

The Mexican has a rematch option, which he intends to activate, but first will face Golovkin for a third time at super middleweight, he told ESPN.

"We already had that contract [with Golovkin], that agreement, so we have to continue what we started," he said.

"I think those are the two biggest fights in boxing, the fight with Golovkin and the rematch with Bivol.

"Unfortunately, we lost [to Bivol], but that doesn't mean I'm not going to try again. The important thing here is perseverance and we're going to do it again.

"What is certain is that we are going to return in September. And in the coming days, we are going to announce the fight."

A controversial split draw between Alvarez and Golovkin in September 2017 was followed by a Canelo win a year later. That remains the sole defeat of Golovkin's career.