Borussia Dortmund manager Peter Bosz insists his side must beat Bayer Leverkusen on Saturday with his job hanging in the balance following a miserable run of form.

Dortmund have lost four of their last six matches in the Bundesliga, and endured a devastating collapse last weekend when they threw away a four-goal lead to draw against bitter rivals Schalke.

Bosz, the Dutchman who took over at Dortmund in the summer, won six of his opening seven fixtures in charge, but his side have slipped to fifth in…