Chelsea are pushing to address one of the few remaining weaknesses in their squad, with advanced negotiations reportedly underway for Porto's first-choice goalkeeper Diogo Costa.
The position between the posts has lacked the certainty expected from a team aiming to challenge for the Premier League and Champions League, despite Xabi Alonso inheriting a talented group.
Costa's arrival would suit Alonso's build-up approach and could immediately raise confidence across the defence, providing a proven international who is comfortable in possession.
Chelsea have spent much of the window reshaping the squad and creating room for new arrivals, yet they have not secured a clear long-term upgrade in goal.
Robert Sánchez has delivered some strong performances but has not always provided consistent security, while the future of other goalkeepers remains uncertain.
The Porto captain offers leadership, sharp reflexes and the ability to begin attacks with accurate passing, making him a valuable asset for Chelsea's long-term plans.
Costa's record speaks for itself, with 21 clean sheets in the Primeira Liga and 2,907 minutes played, showcasing his ability to deliver under pressure.
Former Portugal international goalkeeper Eduardo has described Costa as 'one of the best goalkeepers', highlighting his exceptional talent and potential to become Chelsea's long-term number one.
Costa's potential transfer is not without its challenges, however, as Porto have set a valuation of €60 million, while Chelsea are reportedly prepared to offer around €40 million.
Bayern Munich and Paris Saint-Germain have also expressed interest in Costa, which could strengthen Porto's negotiating position if either club enters the race, making it crucial for Chelsea to move decisively and increase their offer without automatically paying the full clause.
