There's a clause in the contract of already allocated TV rights for Serie-A, related to increases in subscribers & business results, which when achieved, gets Serie-A an extra €150m / year.
CR7's arrival at Juve can trigger performance based bonuses.
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The existing TV deal for Serie-A is worth €973m / yr for 2018-2021.
With Cristiano Ronaldo's arrival at Juve, the TV deal for Serie-A could now rise up to a max of €1.113bn / yr, based on pre-defined parameters related to rise in subscribers & business results