The 22-year-old will join his compatriot Arkadiusz Milik in lining up for last season's Serie A runners up in 2016-17 after impressing while on loan at Empoli last season
Napoli have signed midfielder Piotr Zielinski from Udinese for an undisclosed fee.
The 22-year-old was strongly linked to Liverpool earlier in the summer but has completed a move to the south of Italy after impressing while on loan at Empoli last season.
Zielinski was a part of Poland's squad at Euro 2016 but made only one 45-minute appearance in France as Adam Nawalka's side reached the quarter-finals.
He joins his compatriot Arkadiusz Milik in signing for Napoli after the Ajax striker completed a €32 million move on Tuesday.
Zielinski will also link up again with defender Lorenzo Tonelli, who was his team-mate at Empoli last season and joined Napoli for €10m in May.
Napoli did not disclose the terms of the deal or the length of Zielinski's contract in a press release announcing the signing on Thursday evening.
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