Bayern Munich will be without winger Arjen Robben for several weeks after he suffered a stomach muscle tear in the shock 2-0 defeat to Borussia Monchengladbach on Sunday . Robben , who has only recently returned from a back injury , was taken off after just 24 minutes following a challenge from Gladbach 's Tony Jantschke . The Dutchman could now be a doubt for Bayern 's Champions League quarter-final first leg against Porto on April 15 with the club saying he would be out 'for several weeks . ' Arjen Robben tore a stomach muscle in Bayern Munich 's loss to Borussia Monchengladbach . Robben had only just returned from a back injury but now faces an absence of several weeks . Robben heads down the tunnel in the 24th minute after going off injured for Munich . 'His injury is almost as bad as the defeat , ' said Bayern Munich CEO Karl-Heinz Rummenigge . The winger , who missed last week 's win over Werder Bremen and was a surprise inclusion in the starting line-up on Sunday , is the league 's second-top scorer with 17 goals this term . Deespite suffering their first home defeat of the season , Bayern are still 10 points clear at the top of the Bundesliga . 'They barely got into our half before they scored their first goal and it 's not easy to break down a side who pack their defence , ' said Bayern boss Pep Guardiola . Munich boss Pep Guardiola bemoaned his team 's first defeat at home in the Bundesliga this season . Manuel Neuer ( centre ) spills a shot from Raffael as Bayen Munich lost to Borussia Monchengladbach . Monchengladbach 's players celebrate their win after the final whistle with supporters . 'We failed to break down their defence and they counter-attacked superbly , but we did all we could . We still have a 10-point lead , but we must fight until the end to defend our title . 'We still have eight games left and we have the chance now to regroup during the international break . '
Bayern Munich lost 2-0 to Borussia Monchengladbach on Sunday . Arjen Robben went off injured after 24 minutes of the encounter . The match was played in front of a crowd of more than 50,000 at the Allianz Arena and saw Dortmund win for only the second time this season.