The Glazer family, whose representatives are the owners of Manchester United, were not satisfied with official offers to sell the club's shares, according to the Financial Times.
Qatari investors and British businessman Jim Ratcliffe are bidding to buy the team.
According to the source, the intermediaries have told the interested parties that they need to improve their proposals to expect a deal.
The glaziers have also received non-public inquiries from other potential buyers, including those that talk about becoming a minority owner. This would allow them to raise capital at a more attractive price and maintain control of the club.
The Glazers are not in a hurry to make a decision and are waiting for the most favorable option, but the situation should be finalized by the summer in order to plan MU's work in the transfer market.