Deutinger was assistant coach at Spvgg Unterhaching between July 1993 and April 2004.
[5] Deutinger guided Unterhaching to 14th place in the 2005–06 2.Bundesliga season[6] and to the quarter–finals of the 2005–06 German Cup.
[7] On 19 March 2007, Deutinger and Unterhaching parted ways "by mutual agreement".
[8] Deutinger's final match was a 3–0 loss to SC Paderborn 07 on 18 March 2007,[9] which left Unterhaching in 16th place in the 2006–07 2.
[3] Deutinger returned to Unterhaching to become head coach of their reserve team between 1 July 2010 and 30 June 2011.