The contract with the giant German sports manufacturer will earn the Rossoneri €10.5m a season, meaning that between now and 2016 the club will receive €84m.
This figure is somewhat less than the €140m that Inter will earn with Nike over the next 10 years, but it still represents an impressive deal.
The money that Milan will make will be largely used to buy a series of young players.
This Sunday 18-year-old wonderkid Alexandre Pato will make his debut for the club, but without the Brazilian the Rossoneri have the highest average age of Serie A: 31 years.
At the beginning of next season Milan aim to cut this median to 28 by offloading a number of veterans.
The 39-year-old Paolo Maldini will retire, while Cafu (37), Serginho (36), Ba (35), Fiori (38) and probably Dida (35) will all be released.
Ronaldo, who turns 32 later this year, also has much work to do if he is to convince the club to renew his contract that runs out at the end of the season.
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Inter earn 14m a season
Barca is already earning 15m, but will soon sign a contract 30m/season.
and Milan 10m
