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Club for 16 million euros, which will be paid over four years, acquired forward Edinson Cavani.
The 23-year-old footballer was linked with teams such as Milan's Inter and London's Tottenham, so the move to Naples is considered unexpected.
Cavani participated in the recently concluded World Cup, where he scored one goal in six games.
Last season in the Italian championship, the forward scored 13 goals in 34 matches.