we dont have an option on Berardi only an agreement with Sassuolo that we will buy him back, while Real has a fixed option on Morata, thats the difference. it says so in the agreement, that we give Real the option to buy him back at the end of the 15/16 (or 16/17) season for an amount of up to 30M. its very clear to me there wont be multiple payments in this deal
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we didnt have an option to buy Zaza back, only a "gentelemens agreement" to buy him after one season when Sassuolo gave us 7.5M for him. same with Berardi now.
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no, its up to 30M based on number of performances after 15/16 and 16/17 seasons. he already played the required number of performances so the option reached its maximum of 30M for this season