Bayern Munich will be without versatile left-back David Alaba for the closing stages of the season after he was ruled out for around seven weeks with a torn knee ligament . Alaba , out for three months earlier this season after a partial ligament tear in his right knee , was injured while playing for Austria in their 1-1 draw against Bosnia on Tuesday . ' I am bitterly disappointed , ' the 22-year-old told the club 's website . 'But I have a big aim and that is to be there at the season finale . ' David Alaba is tackled by Emir Spahic 's tackle during Austria 's 1-1 draw against Bosnia-Herzegovina . Marc Janko ( left ) celebrates with Martin Harnik and Alaba after he scored against Liechtenstein last Friday . He is set to start rehabilitation work in about a month , Bayern said . Alaba had been in superb form for Bayern since his comeback , helping them stay firmly on track for a treble of titles with some spectacular goals . Bayern , who are top of the Bundesliga with eight games left and through to the German Cup last eight , face Porto in the Champions League quarter-finals later this month . Alaba ( left ) has been in excellent form for Bayern this season as the Bavarian giants chase a treble of titles .
Alaba drew 1-1 against Bosnia-Herzegovina on Tuesday night . David Austria picked up a knee injury during the first half of the game . Austria was out for three months earlier this season after he suffered a partial ligament tear in his right knee .