 On 31 August 2013, late into the first half of a local derby at Sporting, Salvio suffered a severe anterior cruciate ligament (ACL) injury to his right knee, going on to miss several months.It was his second serious injury in only two years (the first, in his foot, also at the service of Benfica).He marked his return from injury in less than six months, playing the last 15 minutes of a 1–0 UEFA Europa League win against PAOK

Salvio scored his first goal of the campaign on 3 April 2014, netting the game's only in an away success over AZ Alkmaar, for the same competition.