Manchester United have received a second Qatari bid to buy the English football giants, British media reported on Saturday.
The Press Association and the Guardian, among others, said Sheikh Jassim Bin Hamad Bin Jassim Bin Jaber AI Thani, the chairman of Qatar Islamic Bank, had placed a second round offer overnight.
British billionaire Jim Ratcliffe made a revised bid on Thursday as Finnish entrepreneur Thomas Zilliacus entered the race to own the Old Trafford club.
Bidders were initially told they had until 2100 GMT on Wednesday to submit new offers, but reports say that has been extended.
No figures have been revealed but one or more of the initial bids were understood to be in the region of £4.5 billion ($5.5 billion).
That would make Manchester United -- who have not won the Premier League for a decade -- the most expensive sports club in history, although it would be short of the £6 billion valuation reportedly placed on United by its current US-based owners, the Glazer family.
Sheikh Jassim and Ratcliffe, the founder of chemicals giant INEOS, remain the front runners to buy United should the Glazers give up control of the club.
Zilliacus entered the race on Thursday, with a bid he said will give fans the chance to own 50 percent of the club.
"My bid is built on equality with the fans," Zilliacus, founder and chairman of investment company Mobile FutureWorks, said in a statement.
The Glazers have angered many United supporters by saddling the club with huge debts since they took over in 2005. They appeared ready to cash out at an enormous profit when they invited external investment in November.
However, they could yet shun the option of selling a controlling stake in the club, with other parties understood to be interested in a minority shareholding.
The Times reported US hedge fund Elliott Investment Management, which sold AC Milan for $1.3 billion last year, has made a bid for a minority stake.
A first round of bidding took place last month and it has been reported there are as many as eight separate potential investors in the club.
Sheikh Jassim is bidding for 100 percent control, aiming to return the club to its "former glories".
A source close to Sheikh Jassim's bid had earlier told AFP he remains confident his bid is "the best for the club, fans and local community".
Ratcliffe, a boyhood United fan, wants to buy the combined Glazer shareholding of 69 percent.
The 70-year-old told the Wall Street Journal this week he was not interested in paying "stupid prices" for one of football's most iconic clubs.
Ratcliffe, who already owns French club Nice, said his interest in United would be "purely in winning things", calling the club a "community asset".
He visited Old Trafford last week along with INEOS representatives, a day after a delegation from Sheikh Jassim's group toured the club's stadium and training ground.
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