The Constellation/Brown-Forman consortium also includes private equity group Blackstone and Lion Capital, formerly Hicks Muse Europe.
Allied Domecq said that it had received a preliminary approach for the company but that it was too early to see if this would result in a formal offer.
Last week it accepted a £7.4bn offer from French drinks group Pernod Ricard.
Speculation has also arisen that Diageo, the world largest drinks company was entering into urgent talks with rival drinks groups to discuss a potential approach.
Any such bid from Diageo would involve a carving up of Allied’s brands between Diageo and other companies.