The move leaves the remaining bidder for Manchester United, Ineos chairman Jim Ratcliffe, in a stronger position.
The exact value that Ratcliffe's bid infers on Manchester United could not be learned, but the sources said it was higher than Jassim's offer of more than $6 billion.
Manchester United is currently valued by the stock market at $3.3 billion.
Representatives for Jassim declined to comment while Manchester United and Ratcliffe representatives did not immediately respond to a request for comment.
Record 20-time English champions, Manchester United has over 650 million fans worldwide, according to market research firm Kantar.
Persons:
Phil Noble Livepic, Sheikh Jassim bin Hamad al Thani, Glazer, Jim Ratcliffe, Jassim, Ratcliffe, Todd Boehly, Malcolm Glazer, Alex Ferguson's, Erik ten Hag, Anirban Sen, Mrinmay Dey, Chizu
Organizations:
Soccer, Manchester United, Europa League, Friends, Reuters, Manchester United Plc, Representatives, Sky News, Chelsea Football Club, Clearlake, Tampa Bay Buccaneers, League, Manchester City, Thomson
Locations:
Stockholm, Sweden, Manchester, New York, Bengaluru