 After reaching promotion to the Superliga, Frederiksen signed a one-year contract extension with Lyngby on 1 July 2010.While working as head coach at the highest level, he took leave as COO in Danske Bank and would only do consulting assignments.During the 2010–11 season, Lyngby was engaged in a relegation battle but managed to avoid this in the final fixture of the season, on 29 May 2011 in a 2–0 home win over OB.