On 29 June 2017, club president Luís Filipe Vieira gave the motto for the coming season, ' Rumo ao Penta', and promised a renewed ambition to conquer an unprecedented fifth-straight Primeira Liga title for Benfica.

Internationally, Benfica competed in the UEFA Champions League for the eight time in a row but failed to gain a single point in the group stage for their first time, finishing with a negative goal difference of 13, which became the worst campaign of a Portuguese team in that competition. Moreover, they were eliminated in the third round of the Taça da Liga. Benfica also entered the Taça de Portugal as title holders but were eliminated in the fifth round. īenfica played in the Primeira Liga as four-time defending champions for the first time in their history and finished second. It started on 5 August 2017 with Benfica's victory in the Supertaça Cândido de Oliveira and concluded on. The 2017–18 season was Sport Lisboa e Benfica's 114th season in existence and the club's 84th consecutive season in the top flight of Portuguese football.

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