Koller announced his retirement from football in August 2011 after a series of injuries .
On 5 December 2009 , Koller returned to France , joining Championnat National team AS Cannes , with a contract until June 2011 .
Koller announced Koller 's retirement from football in August 2011 after a series of injuries .
On 5 December 2009 , Koller returned to France , joining Championnat National team AS Cannes , with a contract until June 2011 .