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German promoter Bernd Boente said on Tuesday Haye's manager, Adam Booth, had told him "five minutes ago" the Briton would return to the ring if he could fight either of the Klitschko brothers.
"The option is still there. It really depends only on the business case," Boente told Sky Sports News.
"We are in constant contact. We are still awaiting some numbers from British TV and then we'll see if the business case is realistic."
He said Wladimir Klitschko's older brother Vitali, the WBC heavyweight champion, was the most likely opponent. If a fight was to take place it would be in February or March.
"A rematch (with Wladimir) makes no sense because there are no questions after the first fight. You can only promote a fight if there is a thrill," Boente said.
"Against Vitali it's a different thing. Vitali has a totally different style. Vitali said after the fight he wanted to finish what his brother didn't do, meaning knock out David Haye."
Haye, whose trash-talking before the July fight angered the Klitschkos, blamed the defeat on a broken toe. He suggested he would be willing to postpone retirement if the Ukrainian agreed to a swift rematch.
That defeat was Haye's first in seven years and left his record at 25-2. Before joining the heavyweight division, Haye was the unified cruiserweight champion.
Haye's representatives were not available for comment on Tuesday but local media reported the Briton was planning a news conference for Thursday, presumably to announce his retirement.
The British Boxing Board of Control confirmed on Tuesday that Haye had indicated he was not renewing his license.
