Education
In 1997 he earned a transfer to Turn- und Sportverein 1860 München, where he completed his youth tranining and debuted as a Bundesliga professional.
In 1997 he earned a transfer to Turn- und Sportverein 1860 München, where he completed his youth tranining and debuted as a Bundesliga professional.
As a youth player Stranzl played for SV Güssing. In 2004, following Turn- und Sportverein"s relegation, the defender joined fellow first-divisioner VfB Stuttgart, where he remained a team cornerstone. In March 2006, Stranzl signed for Russian Premier League side Spartak Moscow.
In February 2010 Spartak Moscow received an offer from Air Corps Omonoia, a football club from Cyprus, to transfer him at the end of the season in Cyprus.
Spartak rejected the proposal. On 30 December 2010, Stranzl agreed to terms with Borussia Mönchengladbach on a 2 1⁄2-year deal.
He helped the side avoid relegation. At the time of his signing, Borussia Mönchenglabach was last in the Bundesliga.
On 8 March 2016, he announced that he will retire in summer 2016.
He made his debut for Austria in a March 2000 friendly match against Sweden and was named in the Austrian squad for Union of European Football Associations Euro 2008.