Bidders were granted an extension to the previous deadline of Wednesday this week in order to lodge improved offers to purchase the club.
A rival bid from Sir Jim Ratcliffe and INEOS was confirmed in recent days, with Sheikh Jassim's representatives now confirming that they too have upped their offer.
Reports claim United had expected to receive Sheikh Jassim's latest bid by Friday night, though 'finer details' had to be sorted and it was submitted in the early hours of Saturday morning instead.
Raine Group, who are handling the sale, have also received a number of offers for a minority stake in United, with one notably coming from Elliott Investment Management - the former owners of AC Milan.
Meanwhile, Finnish businessman Thomas Zilliacus, who claims to have submitted a speculative offer earlier this week, called on Ratcliffe and Sheikh Jassim to join his bid on Saturday in order to act in the best interests of the club.
When will Man Utd be sold?
The Glazers are looking to sell United before the summer transfer window, though 90min has consistently reported that they will back away from deals if their £6bn valuation is not met.
Recent bidders are likely to hear back from Raine Group in a week.
