6. Thibaut Courtois
Atletico Madrid loanee Courtois is the most wanted goalkeeper in Europe, with Real Madrid reportedly ready to challenge their city rivals for the 21-year-old’s signature this summer. Courtois has insisted he is happy to return to parent club Chelsea but also says he doesn’t want to be number two behind Blues stalwart Petr Cech, leaving Jose Mourinho with a decision to make. The West London outfit could demand as much as €30m for the talented Belgium international if they do decide to sell.