Saul "Canelo" Alvarez will take on Liverpool fighter Callum Smith on December 19.
The pair will face off in the United States just before Christmas with the WBA and Ring magazine world super-middleweight titles on the line.
Smith, quoted on Matchroom's Twitter feed, said: "I've been wanting a big fight since becoming world champion, so I'm pleased that during these challenging times we can deliver to the fans a fight between the very best in the division.
"I truly believe I (will) beat him and will prove that 168lbs is my division."
Smith had set his sights on the Mexican back in June, telling the PA news agency: "If I clean out the super-middleweight division and if he's in that division then I'm the only fight for him."