The Italian has netted nine times for Southampton so far this season and is understood to be on the radar of Bianconeri boss Massimo Allegri, who may look to bolster his attacking options during the January transfer window.
"He's a very complete striker, he's not only physically strong, he knows what happens around him, has good technique, is tall but he's not slow, his co-ordination's very good. He's clever in the box, has a good header, is a good finisher, and is in my opinion one of the best," Koeman said.
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