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Must's chief executive Duncan Drasdo confirmed the group had been in attendance at Monday's Red Knight meeting and had been involved in discussions with the group "for some time".

"This development is hugely welcome as there is a genuine desire to see a change of ownership at Manchester United," he said.

"Initially the Red Knight Group has effectively set a challenge to Manchester United supporters to demonstrate they wish to see an alternative ownership proposal developed.

"In the first instance supporters are being asked to do this simply by joining the free online membership of the Supporters Trust and swelling its ranks to an initial target of at least 100,000.

"It is also essential for a majority of two key groups, the Old Trafford Season Ticket holders and those with Executive facilities, to show their appetite for participation by joining the Must online campaign."

Must has recruited 53,520 members and recently started working with Blue State Digital, a communications agency that worked on Barack Obama's successful US Presidential election campaign.

Their "Green and Gold" campaign has seen supporters don the colours of Newton Heath – the club was renamed Manchester United in 1902 – with plenty of green and gold scarves in evidence at Sunday's Carling Cup final.

BBC sports news correspondent Gordon Farquhar says the idea of an attempt to oust the Glazers has been a long time in coming.

"The takeover of Manchester United by the Glazers was controversial, and many fans were opposed to the way the deal was put together, involving high levels of borrowing," he said.

"The latest accounts show debts at United's parent company increased to more than £700m, and a recent bond issue, while successful, raised concerns further

"The vocal campaign has been stiffened by the emergence of the Red Knights group which includes bankers and business experts.

"Keith Harris has advocated fans starving the club of cash by not renewing season ticket or buying merchandise to force the club to consider a sale

"Should that happen this consortium wants to be ready to make an offer but for now, according to the Glazers' spokesman, the door is firmly closed."

The City financiers insist that their initiative is about changing the owners and that they have complete confidence in chief executive David Gill and manager Sir Alex Ferguson.

The "Red Knights" group also accepts that any takeover would have to be agreed by the Glazers, but that the club's American owners cannot prevent them from putting forward a proposal.