Reading midfielder Jem Karacan rates teammate Alex McCarthy in the £20 million class.
The goalkeeper is being linked with Liverpool and Newcastle United.
Asked how much he is worth, Karacan said: "Around 15 to £20million? You see how much young English players go for - there are some crazy sums out there.
"I don't see why he shouldn't be in that bracket. It would definitely take a lot of money to get him away from Reading - that's how our club works."