Premier League clubs have been urged to pay all staff above the minimum wage after spending £1.41bn on players.
Many cleaners, security guards, caterers and other staff do not earn enough money to cover the cost of living, the charity Citizens UK said.
The clubs who have not signed up have been accused of losing touch with “the lives and struggles of workers”.
Companies accredited by the Living Wage Foundation commit to paying all staff and any third-party contract workers the voluntary rate of £9 an hour and £10.55 in London, higher than the statutory UK National Minimum Wage of £8.21.
“Considering the amount of money in football, it would be great to see the club paying all their staff a fair and decent wage,” he said.
Premier League clubs made a record combined revenue of £4.8bn in the 2017-18 season.
By the end of transfer deadline day on Thursday the top clubs in English football had spent £1.41bn in a summer of signing new players – just short of the £1.43bn record set in 2017.
Citizens UK said a new football season was starting with employees “left on the breadline” which was “not right when clubs are splashing out record fees on players”.