Tottenham They are said to be considering a transfer move Rayo Vallecano defender Andrei Ratiu.
Spurs are said to be worried about the future of the current right-back Peter Leek amid the rumored interest from Real Madrid and Manchester City.
City are looking at Porro as a long-term option to come in for Walker and Spurs are preparing for a summer bid for the 25-year-old.
As a result, Ange Postecoglou is keeping his options open on a replacement, with Ratiu impressing at Vallecas since his 2023 transfer from Huesca.
Reports from Fichajes.net point out that Ratiu has a €25m release clause in his contract at Rayo and the club could accept a lower fee if Spurs move quickly.
Losing Ratiu would be a blow for Rayo, but could allow the squad to improve elsewhere for the 2025/26 season.