After Espanyol announced on Saturday that he would be leaving for the Serie A side, the defensive midfielder has put pen to paper on a contract which runs until 2019
La Liga outfit Espanyol announced on Saturday that they had agreed to sell the 24-year-old to the Serie A side and the deal has now been ratified, making him the Partenopei's fifth acquisition of the summer.
Lopez told Napoli’s official website: "I'm happy to be at Napoli, an important club with a wonderful audience."
The defensive midfielder came through the club's youth system and, after a loan spell at Leganes followed by a brief switch to Huesca, Lopez returned to Espanyol in 2013 before going on to play 33 times in the league.
Lopez, who made 41 appearances in all competitions for Espanyol, is expected to slot into the berth vacated by Switzerland international Valon Behrami, who left Serie A for Hamburg during the close-season.