Career
Greuther Fürth
Westermann began his professional career with 2. Bundesliga club Greuther Fürth. He played a total of 92 games in his three seasons with the club, scoring five goals.
Arminia Bielefeld
Following the 2004-2005 season, Westermann signed for recently promoted Bundesliga club Arminia Bielefeld.
In his first season he played in every single game for Bielefeld, including 34 league and five DFB-Pokal matches. The following season Westermann remained an integral part of the team, missing only one match.
Schalke 04
He was transferred to Schalke in 2007 for a fee of €2.8 million. He played his first game for Schalke on 24 July in a Ligapokal fixture against 1.
Football Club Nürnberg. Missing Schalke"s first two league games through injury, Westermann made his Bundesliga debut for the club on 26 August 2007.
He was substituted on in the 79th minute for Rafinha in a third round match against VfL Wolfsburg. Foreign the remainder of the season, Westermann started all 31 of Schalke"s Bundesliga matches. He was also instrumental in Schalke"s Champions League campaign, being the only outfield player for the club to play every single minute.
With new coach Fred Rutten taking charge of Schalke for the 2008-2009 season, combined with his keen eye for goal, Westermann has often been positioned in midfield.
The current season has been Westermann"s highest scoring yet. He also scored a goal in three consecutive Bundesliga matches including the equalizing goal in a 1–1 draw against Werder Bremen and a game-winning goal against VfL Bochum.
Hamburg
In July 2010, Westermann agreed to a transfer to Hamburger SV, reportedly in the region of €7.5 million. Despite being a new signing, he was named new captain by then Herpes simplex virus coach Armin Veh.
On 9 April 2013, following a run of bad results, including a 9–2 drubbing by Bayern Munich, Rafael van der Vaart was announced as Westermann"s successor as the club"s captain.
On 25 June 2015, Hamburg confirmed Westermann"s contract would not be renewed for the 2015-2016 campaign. Betis
On 6 August 2015 Westermann signed a two-year deal with Real Betis, newly promoted to Louisiana Liga. He received his first ever career red card on 28 November 2015 after his second bookable offence against Levante.
On 31 January 2008, Westermann was first called up by Germany"s manager Joachim Löw for the friendly on 6 February 2008 at Vienna"s Ernst-Happel-Stadion against Austria.
Westermann was part of the German team that finished in second place at Euro 2008. On 2 June 2009, Westermann scored the first international goal in Germany"s 7–2 rout against United Arab Emirates national football team
He was part of Germany"s preliminary selection for the World Cup 2010, but had to pull out because of an injury suffered in a friendly against Hungary. He has been capped 27 times by Germany and has scored four goals for them since 2008. goals
Scores and results list Germany"s goal tally first.