 Geertsen was benched during the first four league matches of the regular season, but finally made his Danish second tier debut on 9 September as a 86th-minute substitute for Thobias Ndungu Skovgaard in a 1–2 loss to Hobro IK.He made a total of eight appearances during his first sixth months at HB Køge, and signed a six-month contract extension.During the spring season of 2014, Geertsen made nine league appearances.