Career as a coach
| Period | Team | Country | Position | |
|---|---|---|---|---|
| 01/2019 - 06/2020 |  | Hannover 96 |  Germany | Ass. Coach |
| 12/2013 - 08/2018 |  | Ferencvárosi TC |  Hungary | Ass. Coach |
| 10/2010 - 04/2011 |  | Gençlerbirliği |  Turkey | Manager |
| 07/2009 - 10/2010 | | Gençlerbirliği | Turkey | Ass. Coach |
| 03/2007 - 06/2008 |  | Borussia Dortmund | Germany | Ass. Coach |
| 01/2004 - 01/2007 |  | Hamburger SV | Germany | Ass. Coach |
| 09/2003 - 06/2005 |  | Ghana |  Ghana | Manager |
| 07/2002 - 12/2002 |  | Asante Kotoko | Ghana | Manager |
| 01/2000 - 02/2001 |  | VfL Bochum | Germany | Manager |
| 07/1995 - 12/1999 | | VfL Bochum | Germany | Ass. Coach |
National teams managed
| Season | Team | Position | |
|---|---|---|---|
| WC Qualifiers Africa 2004/2005 | | Ghana | Manager |
Career as a player
| Period | Team | Country | Position | |
|---|---|---|---|---|
| 07/1981 - 06/1995 | | VfL Bochum | Germany | Goalkeeper |
| 07/1976 - 06/1981 |  | Preußen Münster | Germany | Goalkeeper |
Club matches
| Competition | Matches | Start | In | Out | Min. | Scores | 11m | Ass | Yellow | Yellow-Red | Red | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bundesliga | 282 | 281 | 1 | 1 | 25.329 | 1 | 1 | - | 4 | - | 1 | » All matches |
| 2. Bundesliga | 21 | 20 | 1 | - | 1.860 | - | - | - | - | - | - | » All matches |
| DFB-Pokal | 27 | 26 | 1 | - | 2.702 | - | - | - | 1 | - | - | » All matches |
| Total | 330 | 327 | 3 | 1 | 29.891 | 1 | 1 | - | 5 | - | 1 |