It follows rumours that Paolo Di Canio was set to raid his old club for a couple of players, and now Napoli hit back threatening to take his star goalkeeper.
Tit-for-tat or utter bollox?
The Belgium international has enjoyed a fine season, and aolo Di Canio is likely to face a fight to keep hold of him this summer.
Arsenal are thought to be keen, but it has now become apparent that Napoli are in the running.
Mignolet has a contract at the Stadium of Light until 2015.