Brighton are targeting Porto left-back Zaidu in case they sell defender Marc Cucurella.
The Spanish flyer is a key target for Manchester City this summer.
The Citizens are eager to add to their capture of Erling Haaland, with Cucurella the ideal left-sided full-back for manager Pep Guardiola.
According to the Daily Star, Crystal Palace are also in for 25-year-old Zaidu, who is represented by Jorge Mendes.
Porto want at least £20 million for the 25-year-old Nigerian, which should not be an issue as Brighton will likely sell Cucurella for double that fee.