 Complete the following phrase:  René Tretschok born 23 December 1968 is a German former professional footballer who played as a midfielder. As a player of Borussia Dortmund he was part of their Champions League victory in 1997. He scored an important goal in the semi final of their victorious campaign against Manchester United, giving Dortmund a crucial 10 lead going into the second leg. He was then rewarded with a place on the bench in the 