Career
Agger is the younger cousin of Danish international defender Daniel Agger, which has coined his nickname "Fætter Agger" meaning "Cousin Agger". Agger started playing youth football with Brøndby IF, and was included in various Danish national youth teams, making his debut for the Denmark under-17 team in August 2004. Playing in the Brøndby reserve team, he got a fantastic senior début for Brøndby IF in August 2006.
He made his Danish Superliga debut in the October 2006 game against Aalborg BK. On 20 May 2011 he scored two goals against Lyngby BK in a Danish Superliga game.
On 31 August 2011, Agger joined Swedish club Djurgårdens IF on loan to the end of the season. On 6 August 2012 Agger moved to Vejle Boldklub on a 3-year deal.
On the 29th of June 2014 Vejle Boldklub announced that Agger had been sold to newly promoted Silkeborg IF a year before the end of his contract. Agger has played 30 matches for various Danish national youth teams and scored 10 goals.