Brentford chief Lee Dykes has set their asking price for David Raya.
The Spain goalkeeper is a target for Tottenham.
When it was put to Dykes that Spurs rate Raya at 20m, he told the Beautiful Game Podcast: "Listen, the market sets itself.
"This summer will be a big goalkeeper market, there's a lot of goalkeepers that will be available. Phil and Matt will assess the valuation at the time. My point at David Raya is you need to pay double because he can play No10. You get two positions."
Asked if Manchester City's Ederson was the best goalkeeper with the ball at his feet, Dykes added: "No, Raya is up there. I watch him every day in training, he's top level."