AC Milan legend Billy Costacurta praised Inter Milan coach Claudio Ranieri after victory over Genoa.

Costacurta felt Ranieri's tactical changes won the game.

"Yuto Nagatomo surprised me and did really well in the two phases," said Costacurta.

"But Ranieri made a perfect change by inserting (Ricky) Alvarez, really should be applauded."