The 26-year-old, whose brother Julian plays for Canada, will team up with Spanish forward Michu, who moved from Swansea to Napoli earlier in the transfer window.
Third in Serie A last season, Napoli have been relatively quiet in the transfer market with defender Kalidou Koulibaly their only other new signing.
Rafael Benitez's team were held 1-1 at home by Athletic Bilbao in their Champions League playoff first leg tie on Tuesday, their first competitive match of the season.
(Writing by Brian Homewood in Berne; editing by Josh Reich)
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