Man Utd’s American owners have told prospective owners to submit revised offers to buy the club by 9pm on Wednesday.
It is expected that a bid from Qatar, led by Sheikh Jassim bin Hamad Al Thani, will be made ahead of the latest deadline.
A delegation from Qatar was at Man Utd’s Old Trafford stadium to hold talks with owners last week.
Qatar eyes Man Utd deal
The drawn-out sale of the club is thought to be taking so long as the incumbent Glazer family value the club at around $7.5bn and no offers to match this have yet been received.
Qatar’s original bid has been reported to be in the region of $6bn.
Man United were put up for sale in November.
A statement from the club at the time said: “Manchester United plc, one of the most successful and historic sports clubs in the world, announces that the Company’s Board of Directors (the “Board”) is commencing a process to explore strategic alternatives for the club.
“The process is designed to enhance the club’s future growth, with the ultimate goal of positioning the club to capitalise on opportunities both on the pitch and commercially.
“As part of this process, the Board will consider all strategic alternatives, including new investment into the club, a sale, or other transactions involving the Company.
“This will include an assessment of several initiatives to strengthen the club, including stadium and infrastructure redevelopment, and expansion of the club’s commercial operations on a global scale, each in the context of enhancing the long-term success of the club’s men’s, women’s and academy teams, and bringing benefits to fans and other stakeholders.
Executive Co-Chairmen and Directors, Avram Glazer and Joel Glazer said, “The strength of Manchester United rests on the passion and loyalty of our global community of 1.1bn fans and followers. As we seek to continue building on the Club’s history of success, the Board has authorized a thorough evaluation of strategic alternatives.
“We will evaluate all options to ensure that we best serve our fans and that Manchester United maximizes the significant growth opportunities available to the Club today and in the future. Throughout this process we will remain fully focused on serving the best interests of our fans, shareholders, and various stakeholders.”