Ineos owner Sir Jim Ratcliffe and Qatari banker Sheikh Jassim will submit improved bids to buy Manchester United before Wednesday's 21:00 GMT deadline.
The two parties, the only publicly-declared bidders, met with United officials this month.
Both are understood to have held positive meetings while visiting Old Trafford and United's training ground.
Ineos want to buy the combined Glazer shareholding of around 69%, but the Qataris are targeting 100% of the club.
The two parties, the only publicly-declared bidders, met with United officials this month.
Both are understood to have held positive meetings while visiting Old Trafford and United's training ground.
Ineos want to buy the combined Glazer shareholding of around 69%, but the Qataris are targeting 100% of the club.