In a football match, two teams typically compete against each other. Therefore, in the match against Bayer Leverkusen, there are **two teams** competing. The match is usually structured as a game between two teams, and the purpose is to determine the winner or to decide the outcome of the game. The specific details of the match, such as the venue, date, and time, are not provided in the query, but the general setup is clear: two teams are competing, and the match is likely to determine the winner or to settle the position of the opposing team.