Nicolaj Agger

Brøndby IF

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 made his senior debut for Brøndby IF in August 2006, replacing Morten "Duncan" Rasmussen and scoring two goals in the 4–0 victory over FC Flora Tallinn in the second qualification round of the UEFA Cup, after being subbed on in the beginning of the second half. Agger made his Danish Superliga debut in an October 2006 matchup against AaB. In the summer of 2007, Agger was officially promoted to the first team squad. He made nine league appearances for Brøndby in his first two seasons.

Loan to SønderjyskE

On 2 September 2009 it was announced, that SønderjyskE had signed Agger a 4-month loan deal. In November 2009, Agger broke his ankle in a match against HB Køge and was ruled out for six months. While Agger was loaned out to SønderjyskE, Brøndby would extend his contract until December 2013. On 20 May 2011, he scored two goals against Lyngby Boldklub in a Danish Superliga game. After his return from a loan spell at SønderjyskE, Agger became a regular part of the Brøndby squad and played 26 league games in the 2012–13 season. However, during the season, he received less and less playing time, and he would eventually leave the club on loan once again.

Loan to Djurgårdens IF

On 31 August 2011, Agger joined Swedish club…

Agger has played 30 matches for various Danish national youth teams and scored 10 goals.