"Business people will always consider a proposition, and what's happening now is that people are leaping between someone listening to a proposition and accepting a proposition," the source told Reuters on Sunday.
Representatives of US sports tycoon Malcolm Glazer have made an unsolicited approach to Cubic Expression - McManus' and Magnier's investment vehicle - sources said on Friday.
This follows an announcement by the world's richest club at the start of the week that it had received a bid approach and that it was unclear whether this would lead to a formal offer.
Two Sunday newspapers suggested Irish racing magnates Magnier and McManus would be prepared to accept an offer of more than 300 pence a share for their 28.9 per cent holding.
A source close to the situation told Reuters Glazer is considering an offer price around 300p. A spokesman from Glazer declined to comment.
The Sunday Times said that the men would be prepared to sell at 310p, while the Independent on Sunday said a price of 320p had been considered.
