|Date of birth||31 January 1961|
|Place of birth||Hagen, West Germany|
|Height||1.80 m (5 ft 11 in)|
|* Senior club appearances and goals counted for the domestic league only.
† Appearances (Goals).
Born in Hagen, North Rhine-Westphalia, Otten played 13 years as a professional at Werder Bremen, making his Bundesliga debut at the age of 18 and never losing his starting position again (except through injury) until the end of 1990. He totalled 308 top division matches, scoring his only goal on 26 November 1983 in an 8–1 home routing of Kickers Offenbach; in the 1987–88 UEFA Cup, he took the pitch in the 66th minute of a match at Spartak Moscow (after a 1–4 loss in the Soviet Union), and helped turn things around with a tough approach, for a final 6–2 home win.
After leaving Bremen in 1992, having played twice as the club won the Cup Winners' Cup, Otten had a spell in the second division with VfB Oldenburg, then spent a couple of seasons in the amateur leagues before retiring from the game. He gained six caps for West Germany in 1983 and 1984, but was not selected for UEFA Euro 1984.
- European Cup Winners' Cup: 1991–92
- Bundesliga: 1987–88
- DFB-Pokal: 1990–91
- DFB-Pokal runner-up: 1988–89, 1989–90
- "Tore im Nebel, Waschmaschinen für den Klassenfeind" [Goals in the mist, washing machines for the class enemy] (in German). Rund Magazin. Retrieved 19 October 2012.
- "1991/92: Bremen shine in Stadium of Light". UEFA.com. 1 June 1992. Retrieved 23 May 2013.