Bayern Munich midfielder Thiago Alcantara has undergone successful knee surgery in Barcelona. Dr Roman Cuga performed the operation, while Bayern doctor Lutz Hansel was also present. Upd. at 21:54 The 23-year-old has been sidelines for over seven months after tearing ligaments in his right knee and after a training setback he is likely to miss another half-year. Sport EN 23/10/2014 CEST A statement on Bayern Munich’s website read: “The operation on his right knee was successful. There were no complications. Nevertheless, the player will not be available for the coming months.” Thiago joined Pep Guardiola at Bayern Munich last season and has been stricken by injuries in his time there.