Sheikh Jassim bin Hamad Al-Thani is set to up his Manchester United bid to £5.5billion - in a bid to blow rival Sir Jim Ratcliffe out of the race.
United owners the Glazers have set a deadline of 9pm on Wednesday for prospective new owners to submit revised bids for the world's biggest football club.
Initial bids from Qatari banker Sheikh Jassim and INEOS owner Sir Jim Ratcliffe came in around the £4.5bilion mark – well short of the £6bn wanted by the Glazers.