“We strongly believe that now is the worst possible time to implement significant changes,” Must wrote in an open letter to Ratcliffe.
“With the team struggling on the pitch and fan sentiment already at a low ebb, we all need to pull together to lift the team’s performance, not risk deepening divisions or creating further dissatisfaction.”
Last week, the club wrote to fan groups, highlighting that losses over the last three years were “not sustainable.”
Must has urged Ratcliffe and Ineos to show restraint, warning significant changes to ticket pricing and policy could lead to “outright rebellion.”
“Sponsors depend on a passionate and engaged fanbase; alienating supporters risks damaging these critical partnerships,” Must wrote.
The group also warned any moves made without proper consultation risked “poisoning the well” around stadium plans.
The club were boosted over the weekend after the government gave its backing to plans to regenerate the area around Old Trafford, alongside either a redevelopment of the existing stadium or building a new one.
The Must letter concluded: “By freezing prices and avoiding major disruptive policy changes now, you have the opportunity to signal that you value the unique role of fans in Manchester United’s success.
“Together, we can build a stronger future for the club. The consequences of ignoring this are significant, but the benefits of getting it right are immeasurable.”