5) Jan Vertonghen (Tottenham)
Linked occasionally with Barcelona, Tottenham defender Jan Vertonghen is another Premier League-based player who could quit for a move abroad this summer.
6) Laurent Koscielny (Arsenal)
Linked with Real Madrid, Arsenal centre-back Laurent Koscielny could also swap England for Spain this season if he is needed as a replacement for Sergio Ramos at the Bernabeu.