Austria's disappointing Euro 2012 qualifying campaign resulted
in Constantini's departure in September.
The 50-year-old Koller, a former Swiss international,
coached St Gallen to the Swiss championship in 2000 and had a four-year spell
until 2009 at German club VfL Bochum.
He takes over with the aim of taking Austria to the 2014
World Cup, the Austrian Football Federation said.
Koller will not be in charge for the Euro 2012 qualifiers
against Azerbaijan and Kazakhstan this week and next week and will officially
take over on Nov. 1.
"Austria actually play good football. There are many
young players who have great potential," Koller told reporters during his
official presentation. "I cam convinced we can go down a good path.
"I am a coach who wants to win games, who wants to be
successful. Bringing in two or three young players, that is not success." Austria
are fourth in their Euro 2012 Group A on eight points, six behind second-placed
Turkey with Germany already through. They travel to Azerbaijan on Friday before
going on to Kazakhstan on Tuesday.
Their goalless draw against Turkey in September ended their
chances of playing at Euro 2012 and maintained their record of having never
reached the tournament finals through the qualifying competition.
