 He made his Bundesliga debut on 17 September 2011, coming on as a substitute for Patrick Ebert in the last minutes of a 2–2 home draw against FC Augsburg.For 2012–13, Ronny moved into a more attacking midfield position, left vacant after his sibling's departure.He scored a career-best 18 goals precisely in that season, helping his team return to the top flight after one year out.