|Date of birth||4 May 1976|
|Place of birth||Düsseldorf, West Germany|
|Height||1.96 m (6 ft 5 in)|
|1991–1993||1. FC Mönchengladbach|
|* Senior club appearances and goals counted for the domestic league only.
† Appearances (Goals).
Born in Düsseldorf, Jentzsch began his professional career at KFC Uerdingen (then named Bayer), moving in July 1995 to Karlsruher SC. He would have to wait until the 1998–99 season to become first-choice, with the club in the second division.
In July 2000 Jentzsch joined TSV 1860 München, helping the Bavarians to three consecutive mid-table positions upon which he signed with fellow Bundesliga side VfL Wolfsburg. In his first years he was an important part in the team's consolidation in the top flight, but lost his status midway through 2007–08 to Swiss Diego Benaglio, still appearing in 15 matches to help the Wolves to a final qualification to the UEFA Cup.
On 31 March 2009, Jentzsch's contract with Wolfsburg was terminated and, on 9 June, he signed a one-year deal with FC Augsburg in the second level. He played 33 games in his second year to help his new team reach the main category for the first time in its history; previously, in late November 2009, he extended his link a further two years.
Aged 35-36, Jentzsch was again the starter in the 2011–12 season, helping Augsburg finally avoid relegation while posting the joint-ninth best defensive record with 49 goals against. He retired at the end of the following campaign.
- "Jentzsch: Vertragsauflösung" [Jentzsch: Contract terminated] (in German). Transfermarkt. 1 April 2009. Retrieved 19 August 2010.
- "Jentzsch verlängert vorzeitig" [Jentzsch renews early on] (in German). FC Augsburg. 30 November 2009. Retrieved 6 December 2013.