Manchester United are missing out on an extra £17m a season that could be earned by selling the naming rights to Old Trafford.
A new report into stadium sponsorship deals by experts American Appraisal suggests Premier League clubs could earn an extra £50m a season if they sold the rights to their stadium name.
The likes of Arsenal (Emirates Stadium) and Manchester City (Etihad Stadium) have sold the right to re-name their new stadiums, but traditional grounds have largely retained their historical names.
Anfield, the home of Liverpool, and Manchester United's Old Trafford have remained rooted in the history of the club - and many supporters would be furious if that changed.
But American Appraisal suggests United could raise up to £17m a year if they did hand over the naming rights to a major sponsor.
"The real opportunity is for those clubs who have not yet made the leap of faith to re-name their stadium," said American Appraisal managing director Mike Weaver.
"There is untapped revenue and when it comes to negotiating shirt sponsorship, stadium naming rights has to be a strong consideration too."
United's rivals across the city boast the most lucrative naming rights agreement, as American Appraisal values their earning potential at £18m a year following the Etihad deal.
Arsenal's earning potential means they could take home £6.75m through a similar deal with Emirates.