The Dane left his loan with Motherwell to move in a similar transfer to Austria.
Biereth struck in Sturm Graz's 4-0 win against Wolfsberger on the weekend. He also laid on a goal for a teammate.
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Since his arrival, the striker has a total of five goals and a single assist in seven appearances.
Biereth's goal against Wolfsberger was his third in three consecutive games.