The American owners have stressed the club is not up for grabs amid claims of a summit meeting involving key players behind the Red Knights group of wealthy supporters.
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With debts mounting and alarm bells ringing following details contained within the prospectus for the recent £500million bond sale, the Red Knights could launch a bid to buy the club.
Well-known football deal maker Keith Harris - a lifelong United fan - is at the centre of the group, along with Jim O'Neill, chief economist at Goldman Sachs. O'Neill is a close friend of United manager Sir Alex Ferguson.
Their hope is to try to starve the Glazers of cash and persuade them to accept a deal that would net the Americans around £1billion.
That move would certainly be popular with the growing number of fans who have joined the 'Green and Gold' campaign.
However, a Glazer family spokesman said: 'Manchester United is not for sale.'
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There were plenty of scarves in the distinctive colours of Newton Heath, the club which eventually became United, in evidence at the Carling Cup final on Sunday.
And the Manchester United Supporters' Trust, who have always been opposed to the Glazers' ownership, are working with the men who provided the digital strategy for Barack Obama's US presidential campaign on a plan aimed at getting the club's controversial owners to relinquish their grip.
However, as it presently stands, the move seems destined to fail. Members of the Glazer family were at Wembley to watch United overcome Aston Villa to win the Carling Cup.
And, judging by the often-repeated response to further questions about their ownership, it seems they are not going anywhere.
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