5) Jan Oblak (Benfica to Atletico Madrid, £12.6m)
The 21-year-old made 16 first-team appearances for Benfica before being snapped up by the Spanish champions this summer. The Slovenian is yet to make a La Liga appearance.

5) Jan Oblak (Benfica to Atletico Madrid, £12.6m)
The 21-year-old made 16 first-team appearances for Benfica before being snapped up by the Spanish champions this summer. The Slovenian is yet to make a La Liga appearance.