Effenberg, a former Bayern Munich, Wolfsburg and Germany midfielder, feels Werner should be careful as lack of playing time can lead to a lack of motivation, warning the next few months could be detrimental to his career.
"What's not good for such players, of course, is not getting any playing time," he added. "Training is one thing, and at some point, it wears you down if you continue that into the fall. I know examples of players I've played with. Then at some point they're no longer happy and no longer have the willingness to push themselves to the limit. it is a dangerous situation for Timo right now. I'm not sure if it was the wisest decision he made there."