On the very last minutes of the summer transfer deadline day, Siqueira signed a season-long loan deal with Benfica, with an option to make the move permanent for €7 million. He played in the club's 2–0 victory over Rio Ave in the 2014 Taça da Liga Final, and 99 minutes of the loss to Sevilla on penalties in the 2014 UEFA Europa League Final. Benfica also won the Primeira Liga title, with Siqueira playing 18 matches and scoring once, in a 2–0 win over Nacional on 27 October.