Spanish winger Borja Sainz, 25, is of interest to Athletic Bilbao. This interest existed prior to his move to FC Porto last summer and persists due to the possibility of Nico Williams leaving the Basque club. FC Porto would only consider a transfer for an offer exceeding their investment in the player. Porto paid a fixed amount of 13.3 million euros, with a potential for an additional 2 million euros in variables contingent on objectives. His former club, Norwich, retained the rights to 20% of any capital gains from a future sale. Borja Sainz has a contract until June 30, 2030, which includes a 100 million euro release clause. During the 2025/2026 Liga Portugal season, he participated in 30 matches, scoring 5 goals and providing 3 assists.