More than 50 Manchester United supporters groups have listed their demands for potential buyers of the club, including a commitment not to join the European Super League and continued development of the women's team.
In an open letter, fan groups said they want a new owner to invest in the club and realise it is more than just a commercial asset.
Potential bidders have certain demands.
The open letter has been co-signed by official United supporters groups such as the Manchester United Supporters Trust (MUST) and the MUFC Women's Supporters Club.
It said it would be helpful for potential bidders to understand what supporters want from any new owner in order to get their support.
If the Glazers sell, a deal is likely to be done by the spring, according to the sources.
In May 2005, the Glazers bought United.
The majority of the money spent by the club has gone to the Americans.
Since the failed attempt to launch the European Super League there have been widespread supporter protests.