Bayern Munich could be without Xabi Alonso for Wednesday evening's Champions League tie with Arsenal after the midfielder picked up a knee injury in training.

The 35-year-old, who is expected to retire at the end of the season, was helped off the training field on a golf cart following a challenge from teammate Javi Martinez.

Alonso was given a helping hand to his feet and is now a major doubt to play a part in the first leg of the last-16 showdown at the Allianz Arena, potentially adding to a growing list of absentees as Jerome Boateng and Franck Ribery are also expected to miss out.

Former Liverpool and Real Madrid midfielder Alonso has featured on 23 occasions for Bayern this season, including three times in the Champions League group stage.

Arsenal make the trip to Bavaria knowing that they have not progressed beyond this stage in Europe's showpiece competition since 2010.