Club owners Redbird hired Ibrahimovic as an operating partner and senior advisor within Milan.
Ibrahimovic is expected to have a big role in the selection of a new coach and the transfer strategy ahead of the summer market.
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However, Costacurta says he is a little disappointed with Ibrahimovic's impact on the club.
"He could have shown himself a little more, but we don't know everything that happens inside the dressing room. I know he has made his voice heard a number of times," said Costacurta.