Newell's Old Boys showed interest in Marcelo Estigarribia and had an understanding with Atlético Tucumán, but did not finalize the negotiation. Estigarribia eventually signed with Unión.

Unión acquired 100% of Marcelo Estigarribia's pass, who will sign a contract for three seasons, with a link until December 2027. The player was a priority for Kily González, and Unión accelerated negotiations to win over Newell's, who also made a concrete offer. The transfer was completed after Unión's president, Luis Spahn, improved the proposal.

Unión has expressed formal interest in Marcelo Estigarribia. This interest was underscored by Kily González, who acknowledged that Estigarribia is a target following the potential departure of Adrián Balboa to Racing. Several teams have made inquiries about Estigarribia's contractual situation, with a decision on his future expected to be reached in the coming hours. Atlético Tucumán's coach, Facundo Sava, conveyed his desire to keep Estigarribia, considering him an essential part of the team's core. Despite this, the club has received numerous inquiries, emphasizing Estigarribia's unique playing characteristics in the Argentine market. The interest from Unión has been formalized, and a resolution on Estigarribia's transfer is anticipated soon.