Son Heung-min
In January 2014, Brandt moved to Bayer Leverkusen during the January transfer window for a fee of €350,000, where he signed a professional contract until 2019. He made his professional debut on 15 February 2014 in the Bundesliga against Schalke 04. He replaced Son Heung-min after 82 minutes in a 1–2 home defeat. Three days later he made his debut in the European Cup when he came on in the first knockout round first leg against Paris Saint-Germain in the UEFA Champions League. On 4 April 2014, he scored his first goal for Bayer Leverkusen, as he made it 1–1 in the 1–2 defeat against Hamburger SV.