A replacement is needed for injured Brazilian 'keeper Diego Alves, who isn't expected to make a return to action until 2016.
The signing of a top-quality goalkeeper appears to be at the top of the transfer agenda for Valencia at the moment, due to the long-term injury suffered by current first-choice, Diego Alves.
During the final La Liga game of the 2014-15 campaign away at Almeria, a crucial encounter which secured Valencia a return to Champions League action next season, saw the Brazilian assisted from the pitch, having suffered a serious knee injury.
The subsequent prognosis was far from positive for Alves, with analysis discovering that he had sustained serious ligament damage. As such, he isn't expected to make a return to action until early 2016, based on conservative estimates.
There's certainly a lengthy list of prospective replacements in mind, as Valencia scour the transfer market for the most suitable goalkeeping options, including Kiko Casilla of Espanyol, Andres Fernandez of FC Porto, Roberto of Olympiacos, plus suggestions they have been offered Inter Milan stopper, Samir Handanovic.
The bid from Valencia appears to have been aimed at testing the resolve of Casillas, and Real Madrid, amidst suggestions that he's unhappy at the Bernabeu.
Of course, there's also the growing expectation that Manchester United 'keeper David De Gea, will finally make his move to Real Madrid this summer, which adds further doubts over the future of Casillas with Los Blancos.
The offer from Valencia was politely declined by Casillas, according to the radio reports, with the 34-year-old responding that he couldn't possibly play for another team in Spain, that isn't Real Madrid.
Whilst Valencia will now turn their attention elsewhere, unless Casillas chooses to remain at the Bernabeu this summer, such news could spark interest from other clubs around Europe. If he chooses to leave Real Madrid, there certainly won't be any shortage of offers.