The European championship-winning Spanish defender still has three years left in his existing contract, although at the start of the 2025-26 campaign he confirmed that the club have initiated contract talks with him and wants him to remain in west London.
The former Brighton defender said, via BBC Sport: "Yes, it's [the contract renewal] done. We already did it. I'm very happy, the club gave me the confidence and I'm very happy to be here. Hopefully, I will have a great year."
The 27-year-old will be back in action for Enzo Maresca's side on Wednesday as they take on Leeds United away from home.