In the 2012-13 season Brock-Madsen was a vital part of the Randers team that ended third in the league, playing a total of 28 league games and forming an attacking duo with Randers top-scorer Ronnie Schwartz.
Brock-Madsen made his first start for Birmingham on 21 November at home to Charlton Athletic, playing as a lone striker in place of Donaldson who was injured while on international duty.