Career
Early career
Fellner started his coaching career as an assistant coach at First Vienna Football Club in 2010 and was promoted to head coach on 12 June 2013. However, his tenure as head coach lasted 53 days and was sacked on 4 August 2013. Fellner had lost all three league matches.
Losing his first 2 league matches 4–1 and his last match 3–0.
Coaching record
As of 31 January 2014.