The biggest clubs in Europe don't want to make it so easy for their stars to leave. Here's a list of the 10 biggest release clauses in football, which were used to put off even the richest clubs in the world.
10. Toni Kroos (Real Madrid)
Release clause: 500 million euros
9. James Rodriguez (Real Madrid)
Release clause: 500 million euros
8. Dani Ceballos (Real Madrid)
Release clause: 500 million euros
7. Luka Modric (Real Madrid)
Release clause: 500 million euros
6. Marco Asensio (Real Madrid)
Release clause: 700 million euros
5. Isco (Real Madrid)
Release clause: 700 million euros
4. Lionel Messi (Barcelona)
Release clause: 700 million euros
3. Gareth Bale (Real Madrid)
Release clause: 1 billion euros
2. Karim Benzema (Real Madrid)
Release clause: 1 billion euros
1. Cristiano Ronaldo (Real Madrid)
Release clause: 1 billion euros