Career
Bundesliga in Germany. Youth teams
Heerwagen moved at the age of four to Unterhaching in Bavaria. He started his career as field player at local club SpVgg Unterhaching but changed early to the goalkeeper position.
At the age of 14, Heerwagen moved to the youth of Bayern Munich.
SpVgg Unterhaching
At the age of 18, SpVgg Unterhaching offered Heerwagen a professional contract. So he went back to his old club
Heerwagen became first goalkeeper in his first season and promoted with SpVgg Unterhaching in the 2. Bundesliga in 2003. Subsequently, Unterhaching delivered poor results in the 2.
Nevertheless Heerwagen was usually seen as a very talented goalkeeper by different German football magazines.
VfL Bochum
Several professional clubs were interested in the young keeper but Heerwagen decided to go to Bundesliga club VfL Bochum on 10 July 2007. He signed a contract for three years at the club from the Ruhr. He started into the season as second goalkeeper behind the Czechoslovakian January Laštůvka.