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Bayern Munich midfielder Bastian Schweinsteiger is set to miss the start of the Bundesliga season and Germany's next two international fixtures, according to his club's chairman.
Speaking in Munich on Tuesday, Karl-Heinz Rummenigge said the knee injury which Schweinsteiger aggravated during a pre-season match in the United States was likely to sideline the World Cup winner until mid-September.
Bayern Munich are to scour the market for a new defender following the injury to Javi Martinez in the German Supercup.
The Spaniard tore his anterior cruciate ligament after clashing with Borussia Dortmund's Marcel Schmelzer in the game won 2-0 by the Westphalians.
Bayern had previously said they would be signing no more players this summer, but with Martinez ruled out for six months, they have reassessed that.
"We can all see that we now have to do something," said the club's technical director Michael Reschke to Sport1. "We're going to make some considerations."
Former Manchester City defender Daniel Van Buyten has announced his retirement from football.
The 36-year-old, who played for Belgium at the World Cup in Brazil, was released by Bayern Munich at the end of last season but, despite attracting interest from Brussels club Anderlecht, he has decided to call time on his career.
Bayern Munich midfielder Javi Martinez will not play again this year after suffering cruciate knee ligament damage during Wednesday's German Supercup defeat to Borussia Dortmund.
A Bayern statement read: "Javi Martinez and Bayern's worst fears have been realised after it was revealed the midfielder sustained a ruptured cruciate ligament in his left knee in Wednesday evening's Supercup clash in Dortmund.
"The diagnosis was issued on Thursday after the player underwent a medical conducted by FCB chief medical officer Dr Hans-Wilhelm Muller-Wohlfahrt and team doctor Dr Peter Ueblacker.
"Martinez will be out of action for at least the rest of this year."
Borussia Dortmund took the German Supercup for the second successive year with a 2-0 win over last season's double winners Bayern Munich.
Henrikh Mkhitaryan and Pierre-Emerick Aubameyang scored the goals for Dortmund to make sure the Supercup remains the only domestic trophy still to elude Bayern boss Pep Guardiola.
France winger Franck Ribery, 31, has announced his retirement from international duty with immediate effect.
Ribery missed this summer's World Cup in Brazil after suffering a lower back injury in training shortly before the tournament got under way and has now decided he no longer wants to represent Les Bleus.
"I quit," Ribery said in an interview with German sports magazine Kicker. "I have found for myself that this moment has come."