From TheChels.info - The Chelsea Football Club Wiki
| R.S.C. Anderlecht
|| "Purple & White" "Sporting"
|| Constant Vanden Stock Stadium, Anderlecht, Brussels
Royal Sporting Club Anderlecht, usually known as Anderlecht or RSCA, is a Belgian professional football club based in Anderlecht in the Brussels Capital Region. The club was founded in 1908, first reached the highest level in Belgian football in 1921–22, and have been playing in the first division since 1935–36. They are the most successful Belgian side in European competition, and hold the record for most Belgian league titles. Chelsea's only matches against Anderlecht came in the 2005-06 UEFA Champions League group stage, with the Blues winning home and away.