|Date of birth||September 21, 1981|
|Place of birth||Zimbabwe|
|Height||1.91 m (6 ft 3 in)|
|Weight||108 kg (17 st 0 lb) |
|Rugby union career|
|Position||Flanker / Number eight|
|Professional / senior clubs|
|Years||Club / team||Caps||(points)|
|Sevens national teams|
|Years||Club / team||Comps|
Horstmann was a firm favourite of both the players and supporters and was voted players player-of-the-year in the 2005–06 and 2006–07 seasons and managed a double in 2008–09 when he was voted both Club player-of-the-year and Players player-of-the-year. Horstmann Captained Worcester n the 2011–12 season but injury meant he missed a lot of games.
Horstmann plays as number eight or flanker, and has represented the England Saxons for the Churchill Cup tour of North America in July 2006. He was also a member of the IRB World Sevens Series squad in 2003–04 season.
- "Aviva Premiership Rugby - Worcester Warriors". web page. Premier Rugby. Retrieved 26 September 2011.
- "Worcester Warriors' Kai Horstmann and Dale Rasmussen to leave club". BBC Sport. 17 April 2012. Retrieved 27 May 2012.
- "Exeter sign Worcester back-row forward Kai Horstmann". BBC Sport. 3 May 2012. Retrieved 27 May 2012.
- "Hodgson to captain England Saxons in Barclays Churchill Cup opener". RFU. Retrieved 31 May 2006.