Bernard arrived in Guimarães in 2012 from Feyenoord Ghana. After one season in the youth team, he helped the 'Vitorianos' B-team earn promotion back to Segunda Liga, scoring 9 goals. After renewing his contract till 2018, he was immediately promoted to the first team, making his debut in the Primeira Liga at 16 August 2014, also scoring his first professional goal in his debut.