The midfielder, who has been likened to Zinedine Zidane, is wanted by all of Europe’s top clubs ahead of the summer transfer window.
Juventus have already made an offer of £23m, while Chelsea and Manchester United are ready to lodge bids too.
However, according to Super Deporte, Valencia have informed interested club Gomes will cost £50m.
The Spanish side had initially been ready to consider offers in excess of £30m for the 22-year-old.
But, after seeing the level of interest in Gomes, Valencia have now upped their asking price to a staggering £50m for the Portugal international.