The battle to buy Manchester United heated up on Wednesday as Qatari banker Sheikh Jassim Bin Hamad Al Thani returned with a second bid for the English giants.
British billionaire Jim Ratcliffe is also expected to make a second offer for the 20-time English champions.
Raine, the merchant bank brought in to assist the sale of the club, had set a deadline of 2100GMT on Wednesday for interested parties to declare their offer.
But Sky Sports reported that the deadline has been pushed back to allow proposals to be fine-tuned.
United's owners, the Glazer family, have reportedly set a world record £6 billion ($7.3 billion) valuation for a sports club.
Sheikh Jassim's bid for 100 percent control of the club promises to wipe United's $620 million debt and invest in a new stadium and training ground, in addition to backing for the men's and women's teams.
A source close to Sheikh Jassim's bid told AFP he remains confident his bid is "the best for the club, fans and local community."