"It's a lack of manners and respect. Our president, the sporting department and the whole club have always been an example of professionalism," Yuste said, visibly angry, speaking to Movistar+ following the Champions League draw.
He continued: "With those words they've crossed a red line. I don't understand it at all.
"It angers me because Barcelona has always respected every rival and every player in the world. I feel very bad about it, they've crossed a red line."
Yuste said he had still crossed paths with both Miguel Angel Gil MarĂn and Atletico Madrid president Enrique Cerezo in Monaco despite the public dispute.
"We greeted each other because you have to maintain values like courtesy. I don't understand his comments at all," he said.
The exchange marks an escalation in a saga that has already produced a formal statement from AtlĂ©tico denying any prospect of a sale to Barcelona and a lengthy television interview in which Gil MarĂn insisted the club's stance "will not change" regardless of Ălvarez's own wishes.
Barcelona's own president, Joan Laporta, had earlier confirmed the club's offer for Ălvarez remained on the table, prompting AtlĂ©tico's initial statement accusing Barcelona of dishonesty and a lack of transparency â the remarks Yuste was responding to on Thursday.
With days remaining before the transfer deadline, the increasingly personal nature of the dispute between the two clubs shows no sign of cooling, even as the fate of the player himself remains unresolved.