THE Manchester United Supporters' Trust have urged the club to slash prices and install safe standing in an open letter to the Red Devils.
MUST also hit back at manager Jose Mourinho, who criticised the atmosphere at Old Trafford after the club's 2-0 win over Huddersfield.
Earlier in the season, the Portuguese boss said complained the the Theatre of Dreams was too quiet.
He said: "In here the atmosphere is a bit quiet and it is not very, very enthusiastic."
But MUST have hit back as the Red Devils' manager in a statement on their website, addressed to United Group Managing Director Richard Arnold.
It read: "As you know the atmosphere in the stadium is a key issue for supporters and also for the manager and the team.
"Both of our hardcore vocal ends have been impacted over a number of years by the Family Stand and executive facilities expanding across the Stretford End and the current expansion of the disabled section across East Lower."
MUST revealed that they met with club officials recently - and they claim that to help combat poor atmosphere, United should cut prices to attract young fans to the Stretford End.
They said of reclaiming the famous stand: "The biggest single change which would impact on atmosphere would be to reclaim the Stretford End as a traditional “popular end” with cheap tickets, a youthful age profile of highly vocal fans.
"Younger supporters should be given priority on any new migration into a rejuvenated Stretford End. "We appreciate the importance of fair and consistent pricing policies across different sections of the stadium so we recognise that this has to be done with careful consideration of unintended consequences."
TESTING TIMES Man United star Ander Herrera ‘facing two-year prison sentence’ if found guilty of match-fixing
And MUST also believes the club should introduce safe standing to the stadium.
They added: "We welcome your public support for Safe Standing and hope to see Manchester United leading the way in progressing towards its implementation.
"The inclusion of safe standing capacity, in key areas including the Stretford End, is wanted by many supporters and would be an important enabler for co-locating larger groups of friends and for cheaper ticket prices."
MUST concluded their letter by saying: "We acknowledge the positivity of our initial discussions with you and ask that the Club continues to work in partnership with supporters in developing plans to the mutual benefit of the Club and supporters.
"We are keen to push ahead as quickly as possible on discussion of interim measures which will produce progress while we await the major stadium development that is so badly needed."