Manchester United paid Leicester City a reported £85million for Harry Maguire, but Napoli president Aurelio De Laurentiis feels that is too much.
Maguire became the world's most expensive defender after completing a move to the Red Devils, surpassing the £75million Liverpool splashed out on Virgil van Dijk from Southampton.
Laurentiis believes if Maguire cost £85million, his Senegalese central defender Kalidou Koulibaly would cost at least £250million.
"He (Koulibaly) has a clause of £150m," Laurentiis told ESPN .
"But, for example, in England, they paid £85m for a player. In Napoli, I would pay £30-£35m.
"With that in mind, I think Koulibaly's value is £250m if they paid that much for that guy.
"The problem of the super cost of the players is due to England. In England, they gross more money than in France, Spain, Italy and Germany.
"If a club grosses £800m, they have no problem to offer around £80m, £90m, £100m for one player. There is not a real good and fair competition between England and the other countries."