Career
He scored an important goal in the semi final of their victorious campaign against Manchester United, giving Dortmund a crucial 1–0 lead going into the second legal He was then rewarded with a place on the bench in the final, however he remained unused for the entire match. On 25 June 2009, he was named as the new manager of the Hertha Bachelor of Science Under-19 squad.
After Michael Skibbe was sacked as manager of Hertha on 12 February 2012, Tretschok was appointed caretaker.