Campaigners are urging Manchester United to increase the pay of some of its employees because of the "grotesque" difference with players' salaries.
Community leaders, unions and churches are backing a call for the club to increase the pay of workers employed by contractors, such as waitresses and cleaners.
The club said it pays permanent employees the Voluntary Living Wage, which is higher than the statutory national figure.
The group, part of the Citizens UK charity, said if new signing Alexis Sanchez is paid £400,000 a week, as some have reported, it will take him just 82 minutes in a game to earn the annual salary of a low-paid stadium worker.
Sanchez's pay, and millions reportedly given to his agent, they say reveals a "grotesque tale of two halves".