On 27 November 2013, Vidal scored a hat-trick against Copenhagen in the group stage of the Champions League, two penalties and a header. It was his first career hat-trick, and made him the first Juventus player to score three goals in a match in the Champions League since former Juventus player Filippo Inzaghi against Hamburger SV in 2000. He later renewed his contract with Juventus, keeping him at the club until 2017. On 27 February 2014, Vidal scored his first goal in the Europa League with Juventus, opening the scoring in a 2–0 win over Trabzonspor, in the second leg of the round of 16, and helping Juventus to the semi-finals of the competition. Vidal's offensive contribution increased that season, as he managed 11 goals in Serie A and 7 in European competitions, and he was one of the protagonists of Juventus' season as they won their third consecutive league title. His season finished prematurely, however, as he sustained a knee injury.