|Date of birth||22 September 1965|
|Place of birth||Römstedt, West Germany|
|Height||1.85 m (6 ft 1 in)|
|Heart of Midlothian (Assistant Manager)|
|2003–2020||Hannover 96 (goalkeeping coach)|
|2020–||Heart of Midlothian (Assistant manager)|
|* Senior club appearances and goals counted for the domestic league only|
Sievers was in Römstedt, West Germany. He played for Hannover 96 for more than 10 years, and made a club record 384 league appearances, primarily playing in the 2. Bundesliga. He remained with the club through relegation to the Regionalliga and eventually played out his final season in the Bundesliga in 2002. His main career highlight with the club was perhaps winning the 1991–92 DFB-Pokal against Borussia Mönchengladbach, where he saved two crucial penalties during the shootout. On 6 March 2010, he made a comeback with the reserve team of Hannover 96.