The 39-year-old midfielder is preparing for a first season in the Serie A after his summer arrival from Real Madrid.
Costacurta told La Gazzetta Dello Sport: “Still decisive at his age? Someone as successful as he, with that spirit and desire, can always be. It is no coincidence that two trendy movements were sufficient to make AC Milan fans in love. It took very little to understand what he can offer.
“San Siro is a stadium like no other, it is exciting, even if you have played in Madrid for years. And he was; I saw him engaged and impressed by the welcome. Once a week playing could help his performances. On a personal level I trust (Zvonimir) Boban, who spoke about Luka for thirty years and a fantastic champion.”
In the meantime, Costacurta was adamant to the title of Milan.
He insisted: “It must definitely be a goal. The Champions League will be decisive and tiring for the other teams. Milan is not the favorite, but by playing once a week they can participate in the title race next to Napoli and Inter.
“It is no coincidence that (Rafael) Leao already has a different face: in the first few games last year the team was not so focused. Max (Allegri) brings something else, even in terms of energy. We will wait a few games to better understand whether Allegri's Turnaround can be so clear and remarkable and immediately can be immediately.”