Jurgen Klinnsmann returns to football to manage champions Hoffenheim . No team has been busier in the transfer market than ambitious Wolfsburg and Felix Magath 's side are aiming to build on their superb fifth-place last season . Werder Bremen , Bayern Munich , Wolfsburg likely to challenge Bayern the season . Legendary keeper Oliver Kahn retires , while Jens Lehmann back with Stuttgart . Moenchengladbach , Oliver Kahn back in top flight ; Schalke new to Bundesliga .
Jurgen Klinnsmann returns to football to manage champions Hoffenheim . Werder Bremen , Bayern Munich , Wolfsburg likely to challenge Bayern the season . Legendary keeper Oliver Kahn retires , while Jens Lehmann back with Stuttgart . Moenchengladbach , Oliver Kahn back in top flight ; Schalke new to Bundesliga .