The 26-year-old made the announcement immediately after easing to a points win over compatriot, Julio Chavez Jr, at the T-Mobile arena in Las Vegas.
According to Canelo’s promoter, Oscar de la Hoya, the bout is “signed, sealed and delivered” for September 16.
Golovkin will put his WBA, WBC and IBF middleweight titles on the line against the WBO light-middleweight champion.
