Chelsea continue to be in the market for a new number one this season. The Blues have been linked with several shot-stoppers recently following Edouard Mendy's departure.
Kepa Arrizabalaga remains at the club, though Mauricio Pochettino's preference is thought to be recruiting a new goalkeeper ahead of the 2023/24 season.
Mike Maignan and Andre Onana have both been heavily linked with a move to Stamford Bridge, though FC Porto's Diogo Costa has now emerged a fresh candidate. The 23-year-old kept 16 clean sheets last season and has also attracted interest from Manchester United.