The Argentinian has caught the eye in the last seven months, helping his country to World Cup glory and seeing his transfer value sky-rocket. Here, Planet Sport looks at what strengths Fernandez can bring to Graham Potter's Chelsea. Technical talent Fernandez' passing ability will be a welcome addition to Chelsea after they sold midfield operator Jorginho to Arsenal.
Everything you need to know ahead of the Carabao Cup semi-final second leg
Everything you need to know ahead of the Carabao Cup semi-final second leg