Milan owner Silvio Berlusconi believes Ronaldinho can rediscover his best form as the club prepares for life without Kaka.
The Rossoneri have struggled of late, finishing fifth and third in the last two seasons, and they were forced to sell Kaka to Real Madrid this summer to ease their financial concerns.
But Berlusconi, who criticised former coach Carlo Ancelotti for failing to make good use of Ronaldinho last season, believes the two-time Fifa World Player of the Year can excel in his compatriot's absence.
"He needs to be the extra man this season - that's the responsibility of a sale we were forced into making," he told Mediaset.
"But this [sale] will give Ronaldinho space. All the other players also want this to be Ronaldinho's year. He's 29 and in top shape physically.
"All he needs now is the desire to be decisive for this Milan team and I believe we can have faith in him."