According to AS, both Barcelona and Real Madrid have made formal loan offers for Sergio Martínez. Both proposals would involve Martínez joining the respective club's B team for the remainder of the season, and the deals include a purchase option for a permanent transfer before the 2025–26 season. Martínez extended his contract with Racing in November, with the agreement valid until the summer of 2029. This contract extension followed interest from teams including Girona, Hoffenheim, and Salzburg.

FC Barcelona is interested in talented midfielder Sergio Martínez and intends to loan the 18-year-old Spanish U19 international from Racing Santander. The proposed loan would include an option to buy, with Martínez initially intended for the second team. FC Villarreal is also interested in the player. In addition to Barcelona and Villarreal, TSG Hoffenheim and two other Bundesliga clubs have also been linked with Martínez. His contract at Racing Santander runs until 2029 and includes a release clause of three million euros.