BERLIN (AFP) - Bayern Munich's Arjen Robben could be set for a spell on the sidelines after the Dutch star suffered a nasty knee injury on Wednesday.

The 29-year-old scored four minutes into Bayern's German Cup third-round tie at Augsburg but had to be stretchered off 12 minutes later having been sent tumbling by opposition goalkeeper Marwin Hitz.

Robben received lengthy treatment from Bayern medical staff pitchside and the European champions said he had suffered a "deep cut" on his right knee and was in obvious pain.

The extent of the injury will only be known after a scan. Robben has been in outstanding form for Bayern recently, scoring in each of his last four matches for the Bundesliga leaders.