Some booing was heard after Mourinho, whose side face Chelsea on Sunday, live on Sky Sports Premier League, brought off Marcus Rashford for Anthony Martial in Saturday's 1-0 win over Tottenham.

In an apparent reply, Mourinho then said in his programme notes for Tuesday's win over Benfica: "I hope that you enjoy the game more than some of you did against Tottenham."

MUST are keen to speak to the manager about his concerns.

"There are differing views amongst supporters on precisely how to interpret the manager's comments," MUST said in a statement.

"However it's probably fair to say there is a universal desire within the stadium to see atmosphere improved just as there is at other Premier League clubs.

Mourinho shushed the camera after his side beat Tottenham at Old Trafford

"There are a number of factors that have contributed to atmosphere decline over the decades, some of which could be addressed with better co-operation between clubs and supporters.

"MUST would certainly appreciate the opportunity to engage with the manager, as part of our existing dialogue with other club officials, on issues around atmosphere and would be more than happy to meet to discuss his concerns."

United take on Chelsea on Super Sunday but they are not back in action on home soil until November 18, when Newcastle visit in the late Premier League kick-off.