Career
He was also called up three times to the senior Germany squad. Before joining VfB Stuttgart, the central midfielder played at Turn- und Sportverein Beuren and VfL Kirchheim. In the 2004-2005 season, he played 28 times and scored six times for the Regionalliga (third division) team of VfB Stuttgart.
In the same season, he had his Bundesliga debut against Hertha Bachelor of Science on 20 February 2005 (1–0).
In 2006, Gentner"s contract in Stuttgart was extended until 2010. On 18 July 2007, he was loaned to VfL Wolfsburg until summer 2009 and on 11 August 2008 Gentner signed a permanent deal with Wolfsburg.
On 8 January 2010, Gentner announced that he would be joining VfB Stuttgart at the end of the season. After seeing out his contract with the Wolves which ended on 1 July 2010, Gentner returned to Stuttgart on a free transfer.
On 6 January 2013, Gentner extended his contract with VfB Stuttgart until June 2016 with an option for a further year.
Following Tasci"sdeparture to Football Club Spartak Moscow, it was announced that Gentner is to be his successor as the new club captain. Gentner was, on 19 May 2009, called up to the senior Germany squad for their tour of Asia, Gentner made his debut against China on 29 May 2009.