The 25-year-old left the training camp in Switzerland on Thursday after complaining of pain in his knee and will now miss the Supercup, DFB-Pokal opener and first Bundesliga match
Borussia Dortmund midfielder Nuri Sahin will miss his team's Bundesliga opener due to tendonitis in his knee.
The midfielder left Dortmund's training camp in Switzerland on Thursday to have his knee checked in Munich and the Bundesliga club later confirmed that the Turkey star will miss three weeks of training to recover.
The 25-year-old played 45 minutes in Dortmund's friendly versus Rot-Weiss Essen on July 27 - wearing the captain's armband - but has apparently been struggling with pain in his knee for some time.
The problem will see Sahin miss the DFL-Supercup against Bayern Munich on August 13, as well as Dortmund's DFB-Pokal tie against Stuttgart Kickers two days later.
He will also be on the sidelines for his team's first Bundesliga fixture of the season against Bayer Leverkusen on August 23.
Sahin played 34 Bundesliga matches for Dortmund last term, starting 31 games and scoring two goals.