Bayern Munich says Arjen Robben will be out for an undetermined period of time to allow treatment on his groin problem.

Team doctor Hans-Wilhelm Mueller-Wohlfahrt told the club's website Wednesday that Robben needs ''intensive treatment'' on the bone inflammation hich kept the Dutch winger out of Bayern's Champions League playoff in Zurich on Tuesday.

Dr. Mueller-Wohlfahrt says ''the period of his recovery cannot be set at this time.''

The 27-year-old Robben will be evaluated on a daily basis to see how he progresses.

Robben has been beset by back and groin problems since Bayern's season begun.