
Bayer 04 Leverkusen Fußball GmbH, also known as Bayer 04 Leverkusen , Bayer Leverkusen, Leverkusen or simply Bayer, is a German football club based in Leverkusen, North Rhine-Westphalia.
The BayArena is a football stadium in Leverkusen, North Rhine-Westphalia, Germany, which has been the home ground of Bundesliga club Bayer Leverkusen since 1958. It is not a UEFA 5-star stadium, however it is in the process of becoming one.
The stadium was originally known as Ulrich-Haberland-Stadion (pronounced ( listen); English: Ulrich Haberland Stadium), named after a former chairman of Bayer AG, the club's founders. Its original capacity was 20,000.
In 1986, a rebuilding project began to convert it into a modern facility; the project continued intermittently over the following decade. The project was completed in 1997, making the stadium an ultramodern all-seater with a capacity of 22,500. The stadium was renamed BayArena in 1998.