Vitali Klitschko's management team have made David Haye an offer to fight the WBC world heavyweight champion next year.
The Briton anounced his retirement last month after losing his WBA title to Vitali's younger brother Wladimir in July.
But on Monday Haye confirmed his team are in talks about a fight with Vitali Klitschko in March.
"Team Klitschko is in negotiations with Haye and has made him an offer," a management official for the Ukrainian brothers told Reuters on Tuesday. "Now the ball is in Haye's court."
Haye quit boxing on his 31st birthday in October after losing to Vladimir in Hamburg. The Briton blamed his defeat on a broken toe and initially demanded a rematch.
Vitali retained his WBC title in September with a technical knockout of Pole Tomasz Adamek in the 10th round.
Wladimir, who holds the WBO, IBF, IBO and WBA belts, will look to clinch his 50th knockout from 60 professional bouts when he takes on former world cruiserweight champion Jean-Marc Mormeckon in Duesseldorf on December 10.