Hamsik moved to Napoli in 2007 for €5.5. million.
âI regret letting Hamsik go to Napoli for such a low price,â Corioni told Radio CRC on Wednesday afternoon.
Hamsik was rumoured to be a â¬30m target for Milan this summer, but the attacking midfielder will remain at the San Paolo.
âHamsik is not a top champion, but he is still irreplaceable. Players with his characteristics should not be sold.â