The same source has suggested the Azzurri have already agreed a €10 million fee for the talented footballer, with the player soon expected to put pen to paper on a long-term deal with San Paolo outfit.
Mertens can cover all three attacking midfield positions in the 4-2-3-1 formation Rafael Benitez plans to use with Napoli, which makes him a perfect signing.
The 26-year-old joined PSV Eindhoven from Utrecht in the summer of 2011 and quickly proved he would be a great signing for the Dutch giants.
Mertens went on to score no less than 37 goals in 62 Eredivisie matches despite being mostly used as a winger.
Following two very successful seasons, during which he produced no less than 33 assists for his teammates, the Belgian will be given a chance to prove his worth at the biggest stage.