 On 19 September, his free kick completed Swansea's 3–0 win away to Valencia in the Europa League group stage.On 20 August 2014, de Guzmán transferred to Serie A club Napoli, signing a four-year contract.He made his debut as the team began their league campaign on 31 August away to Genoa, replacing Marek Hamšík after 74 minutes and scoring the winning goal in added time.