Manchester United bidders are becoming dissatisfied with the lack of progress on their potential takeover

Those vying for Manchester United are growing increasingly dissatisfied, having received no updates since submitting second bids more than two weeks ago.

There are also growing concerns that if the Glazer family accepts an offer for full control, any chosen buyer may not be in place in time to oversee the summer transfer window.

Second bids were submitted on March 23 by the group of British billionaire Sir Jim Ratcliffe, and a day later by Qatari Sheikh Jassim bin Hamad al-Thani.

After struggling in a short timeframe imposed by Raine Group, the US merchant bankers in charge of the process, both parties were given extended deadlines to place their bids.

At one point, because time was of the essence, those involved expected to hear back in seven days. But that has not happened, and Sportsmail understands that the situation has caused some people frustration and even annoyance.

Sheikh Jassim has already stated his intention to invest heavily if his offer is accepted. Significant funds will almost certainly be made available to manager Erik ten Hag as he attempts to reshape his squad.

It remains to be seen what the Glazers’ next move will be. The bids are thought to have been in the £5 billion range, with the Americans reportedly seeking £6 billion. At this point, they can either enter into exclusive negotiations with one group or call for a third round of bidding.

Some believe that the lack of movement indicates that they are carefully considering all options and researching ways to raise the price.

Aside from the two bidders for full control, Elliott Investment Management of the United States is one of several groups offering cash in exchange for a partial stake.

United would need between £1 billion and £2 billion to either redevelop Old Trafford or build a new stadium and upgrade their training facility.

If the Glazers decide to stay, the reaction from supporters is unlikely to be positive. At games, anti-Glazer chants calling on the Americans to sell United have become common, and a new, massive banner reading ‘Glazers Out’ was displayed above the players’ tunnel during United’s most recent home match against Everton.