BERLIN (Reuters) -Borussia Dortmund's undefeated run has filled the team with confidence ahead of Der Klassiker at champions Bayern Munich on Saturday despite the hosts' impressive 10-match winning streak in all competitions, coach Niko Kovac said on Thursday.

Kovac, who took over in the middle of last season, has seen Dortmund go unbeaten in Germany and Europe this term. They sit second in the Bundesliga, four points behind Bayern.