The Manchester United Supporters Trust (MUST) has called on the Glazers to speed up the sale process of the club after a third round of bids were invited.
The Glazers, who have owned United since 2005, have been exploring a potential sale of the club since November last year, although selling a minority stake has also been considered.
United supporters had hoped that the process would bring about the end of the deeply unpopular ownership which has seen debts loaded onto the club and Old Trafford fall into disrepair, but five months on there has been no movement on any sale or new investor.