Valencia would like to bring players in but to do that, they must sell. Cillessen is one player they are putting on the market.
He has suffered various injuries that stopped him reaching his best and Jaume Domenech is the No1 now.
Cillessen, 31, is worth around €15m and is now up for sale.
Deportes Cope says Valencia want to sign two centre-backs, a midfielder and an attacker, at the least.