Essentially Chelsea and Madrid would never lock themselves into a 10 year deal without having an option somewhere down the line for them to pay a certain amount of money to exit the contract. It's what Chelsea did in 2005 when they paid £24.5m to Umbro to ditch them for Adidas
Also not sure what his exit clause means. Any source?
Didn't know about Chelsea paying to terminate contract. Now I see what you meant by exit clause.