The US-based Glazer family has reportedly rejected a 1.5 billion bid for Manchester United.
The group of wealthy United fans were understood to be planning a 1.2 billion pound offer for the club this summer.
But news of the Glazers' reluctance to accept a higher offer, believed to be from a Middle East consortium last year, is a massive stumbling block, The Sun reports.
United supporters have shown their discontent for the Glazer regime with their "green and gold" protests at Old Trafford this season.
Fans are unhappy with the lack on investment in the team, especially after Cristiano Ronaldo's world record 80-million-pound sale to Real Madrid last year.
Supporters are also worried by the club's spiralling debts which stand at over 700-million-pounds.
