The 21-year-old German reveals that he has been watching video footage of the England international for hours ahead of the encounter at the BayArena.
"On Rooney or [Robin] van Persie I prepare the same way as in Bielefeld," he told reporters. "With my goalkeeper coach we look at video tapes, to be prepared in standard situations.
"You can see if he cuts into a ball or prefers to shoot with the full instep. Even for one-on-one situations, it does not hurt if you know the subconscious mind.
"We want direct Champions League qualification - if we do our homework, then the rest will come by itself."
Bayer are currently a point behind leaders United in second place in Group A.