Manchester United are missing out on more than £26million a season in potential revenue for Old Trafford's naming rights, according to corporate finance advisors Duff & Phelps.
That figure, which is £7m more than Manchester City earn from Etihad's sponsorship of their ground, is contained in a new study of naming rights values in the Premier League.
Duff & Phelps believes the value of this market has risen by 80 percent from £74.6m in 2013 to £135.6m last year, with the league's 'big six' accounting for more than three quarters of that sum.