Alvarez to face Kazakhstan's world middleweight champion Golovkin in rematch
The IBF stripped knock-out specialist Golovkin of his middleweight title after he failed to set up a mandatory defense against Ukrainian Sergiy Derevyanchenko.
The duo could not be separated after last year's bout at the T-Mobile arena in Las Vegas, allowing Golovkin to retain his World Boxing Council (WBC), World Boxing Association (WBA) and International Boxing Federation (IBF) belts.
"I'm happy to inform that we have a fight September 15," De La Hoya wrote on Twitter.
A rematch scheduled for May 5 was canceled after Alvarez failed a drug test for banned substance clenbuterol.
The 27-year-old has been temporarily suspended by the Nevada State Athletic Commission but will be allowed to return to the ring from Aug. 17.