Atlético de Madrid has executed the buyback option on Santiago Mouriño during this summer transfer window. The buyback option is reportedly around four million euros. The transfer has not been officially confirmed by Atlético de Madrid's social media channels.

Atlético Madrid is considering the possibility of exercising a buy-back option for Santiago Mouriño, included in his transfer to Alavés, valued at approximately 3 million euros. Mouriño's recent strong performances have caught the attention of Atlético, who are in need of incorporating two central defenders for the 2025-26 season, making him a potential candidate. Originally signed by Atlético in 2023 and subsequently loaned to Zaragoza, Mouriño was transferred to Alavés for just over two million euros, with a contract extending until 2029. His impressive showings against top-tier teams like Real Madrid and Girona have made him a crucial player under the management of Alavés' Coudet, who has reportedly expressed great confidence in him since assuming the managerial role in December. Mouriño's adaptability and ability to excel in various defensive positions have rendered him an attractive prospect for Atlético as they aim to strengthen their defense for the coming seasons.