Keith Harris, an experienced deal broker, claims an overseas buyer is considering making an offer of between £400million and £500million for Liverpool.
The former Football League chairman, who has been involved in the sales of Aston Villa, West Ham and Manchester City in the past, said due diligence has already been done.
Harris also said the party he was representing was not one mentioned publicly before.
"The overseas buyer we represent has completed due diligence. A huge amount of work has been done," he said.
"It is none of the groups mentioned in the press. The ball is now in our client's court to make an offer.
"I do not think the deal will be done before the transfer window closes this month but the next pressure point is October when some of the RBS loan of £237million has to be repaid. It may happen then. But in the present climate these things are impossible to predict."