Career
Frederiksen played in SønderjyskE from 2006 to 2010. After his big breakthrough in the 2009-2010 Danish Superliga, a transfer to F.C. Copenhagen on 1 July 2010 was announced, but he was supposed to continue in SønderjyskE for the 2010-2011 season. Although, as Morten Nordstrand turned out to be injured for all 2010, F.C. Copenhagen and SønderjyskE agreed on 1 September 2010 to transfer Frederiksen immediately.
He scored his first goal for Copenhagen in a Danish Cup game against Viby IF. Club AaB.
