According to Globo.com, Mastriani is not part of Athletico's plans for the 2026 season. The club has already informed the player that he is permitted to look for a new team. His contract with Athletico is valid until the end of 2026.

Gonzalo Mastriani is awaiting a meeting with Athletico's management to determine whether he will remain with the team during the season or if his future is elsewhere. He is under contract with the club until the end of 2026, and from mid-year, he could sign a pre-contract with another team. Mastriani stated that he thinks this conversation should happen, because nothing had been said to him or to his agent. He added that it is about sorting out the situation and moving forward, and that he has a contract and has always said that he chose to come to Athletico at the best moment of his career.