|Full name||Thomas Hörster|
|Date of birth||27 November 1956|
|Place of birth||Essen, West Germany|
|Height||1.85 m (6 ft 1 in)|
|1987–1988||West Germany Olympic||12||(0)|
|1992–2001||Bayer Leverkusen (youth)|
|2001||Bayer Leverkusen (caretaker)|
|2001–2003||Bayer Leverkusen II|
|2003–2007||Bayer Leverkusen (youth)|
|* Senior club appearances and goals counted for the domestic league only|
Born in Essen, Hörster spent his first three seasons as a professional with local Schwarz-Weiß Essen, in the second division. For 1977–78 he signed with another club in the league, Bayer 04 Leverkusen.
After winning promotion to the Bundesliga in 1979, Hörster was an essential defensive unit for Bayer in the following 13 seasons, his lowest input being 24 games in the 1981–82 campaign. In 1987–88 he appeared in a total of 35 official matches, including nine in the team's victorious run in the UEFA Cup – one goal against FK Austria Wien in a 5–1 home win (also the aggregate score)– even though he did not appear in any of the two matches of the final against RCD Español.
Hörster retired in June 1991 at the age of 34, with top flight totals of 332 games and 16 goals. He remained closely associated with Leverkusen in the following years, working as manager (youth teams, reserves, caretaker) and scout. On 16 February 2003, he was appointed main squad manager, leaving his position on 12 May.