Taty Castellanos has expressed a desire to depart West Ham following the club's relegation to the Championship.
The Argentine striker, 27, has indicated he will not play in England's second tier and aims to return to La Liga.
Sevilla and Real Betis have emerged as serious contenders for the striker's signature.
After a productive spell at Girona, Castellanos is eager to rejoin Spanish football.
West Ham reportedly resists a significant financial loss on a player signed earlier this year, making a loan with an option or obligation to buy the likely structure.
Sevilla has increased interest after recent player sales, while Real Betis is also pursuing him, setting up a transfer battle.
Castellanos joined West Ham in January 2026 from Lazio in a deal worth approximately €29 million.
He scored six Premier League goals in 18 appearances, showing movement, work rate, and link‑up play.
His performances kept him in the Argentina national team, making a prolonged stay in the Championship unattractive ahead of future fixtures.
West Ham's relegation has sparked moves for other key players, including a £85m transfer of Mateus Fernandes to Tottenham.
Crysencio Summerville also moved to Al‑Hilal for £65m.
Jarrod Bowen signed an extension that includes a clause allowing departure if the club fails to secure promotion.
Castellanos could become the next high‑profile departure as the club adjusts to life in the Championship.
