Mohamed Zidan's Borussia Dortmund will open the new Bundesliga season with a tough clash against Bayer Leverkusen next month. The 2010-2011 season will kick off on the 20th of August, but Zidan will definitely miss the opening few three months. The Egypt forward damaged knee ligaments in a Bundesliga game with Hoffenheim back in April and is not expected to return before October. Holders Bayern Munich start off with a home match against 2009 champions Wolfsburg, whereas the top match will see Hamburg clash against Schalke.