4) Nico Williams (Athletic Bilbao)

Chelsea are closely monitoring Spanish winger Nico Williams, who has emerged as a versatile and dynamic wide player for Athletic Bilbao.

The 21-year-old, known for his electrifying pace and ability to take on defenders, has a £48 million release clause in his contract.

Williams has already established himself as a key player for Bilbao, contributing with goals and assists in La Liga.

Chelsea see him as an ideal fit for their system, offering creativity and unpredictability in wide areas. With competition from Arsenal and Liverpool, Chelsea must act swiftly to secure his services.