Chelsea, the flagship club of the BlueCo group, considered signing the 23-year-old Spanish-Argentinian winger Oso to replace Marc Cucurella but ultimately chose Pep Chavarría. Another club in the BlueCo network, Strasbourg, has reached an agreement with Sevilla for the player's transfer. The deal consists of a fixed fee of €10 million, with Sevilla retaining 10% of a future profit, and is pending the player's approval. Oso joined Sevilla in January 2026. Sevilla had previously rejected an offer from the French club for €6 million plus €2 million in variables. Fiorentina and Olympiacos also considered signing Oso, whose contract renewal talks had stalled.