United are keen to bring Otamendi to Old Trafford this summer and the player's agent, Eugenio Lopez, claimed on Monday that, while no agreement was already in place, the centre-back is keen to leave Mestalla in search of a "top" club.
Lopez, who looks after the player's interests alongside Jorge Mendes, said his client would not be speaking to the press about his future, but Salvo says the Spanish side will not be bullied into a transfer by third parties and that the player himself must state his intentions.
"Valencia do not give in to pressure from any agent or any comments," Salvo stated via the club's Twitter account. "Valencia's position will always be the same. If Otamendi wants to leave he will have to say it publicly.
"If he wants to go he will have to come to the club, not an agent, and pay what the club decide he is worth, which is €50 million at least, and with the payment structure that Valencia decide.
"Otamendi is a Valencia player and we are extremely happy with him. Valencia have not received any offer. In any case Valencia are very happy with the player and we would like that he sees out his contract with us."