The Mexican was emphatic when questioned about the goalkeeper's contractual situation, making clear that the Dutchman's involvement will depend solely on his performances and fitness.
Van Oevelen joined Valencia on loan from Ipswich in August and made his debut in the Copa del Rey against Tavernes on Tuesday. However, the agreement between the clubs includes a games clause that could allow the English side to terminate the loan in January if the goalkeeper does not feature in a specified number of matches.
The arrangement has created a potential problem for Valencia. The number of appearances required is reportedly higher than the opportunities available in the Copa del Rey before January, meaning Van Oevelen would need to play in LaLiga as well to satisfy the condition.
The clause was accepted and signed by former Valencia football chief Ron Gourlay before his departure in September. It has raised questions about the club's ability to retain the goalkeeper for the remainder of the season if he does not receive sufficient playing time.
Van Oevelen's position is particularly complicated by the competition for the goalkeeper's place. Stole Dimitrievski remains an established option, and there is no obvious indication that the Dutchman will displace him as Valencia's first choice.
Aguirre was asked whether the contractual requirement would influence his selection, but dismissed the possibility immediately.
"It doesn't condition me at all," he said.
The coach went further, making clear that Ipswich's wishes would have no bearing on his decisions.
"I couldn't care less what Ipswich Town says. He is not going to play because Ipswich Town says he has to. If he is fit, he will play, and if not, someone else will. That doesn't concern me," Aguirre said.
He also insisted that Van Oevelen was training well and was in good physical condition, while stressing that Valencia had several capable goalkeepers available.
"He trains well, he is healthy, he is strong. I have three good goalkeepers," he added.
The comments underline Aguirre's determination to protect his authority over team selection, regardless of the terms agreed between the clubs. While the clause could have consequences for Valencia's planning in January, the coach is unwilling to allow it to dictate his starting line-up.
Van Oevelen's debut against Tavernes gave him an opportunity to make his first appearance for the Spanish club, but his longer-term role remains uncertain. Valencia must now balance the contractual implications of the loan with the manager's preference to select his goalkeeper on sporting grounds.
Aguirre's position is unequivocal: the Dutchman will play when the coach believes he deserves to play, not because of an agreement with his parent club.