Siena coach Giuseppe Sannino has warned Mattia Destro he still has a lot to learn.

Inter Milan and Juventus are watching the Italy U21 striker.

"He's not yet complete as a footballer," said Sannino. "It would be heresy to suggest otherwise. He has margins of improvement.

"He's made his bones this season with us and he's had the honour of leading our attack. Whoever bosses him in the future will have a potential talent at their disposal."