As a language model, I don't have real-time information about the current game being played. However, I can tell you that Olympique de Marseille is one of the most famous football clubs in France and has been playing in the French Ligue 1 for many years. The club has won several major championships and is considered to be one of the top teams in Europe.
If you want to know how many teams are playing today, it depends on which sport or event you are referring to. In soccer, there could be multiple matches taking place depending on the league or competition. For example, if you are looking at the English Premier League, there may be multiple games scheduled for the same day.
It's also worth noting that the number of teams playing today can vary depending on the specific situation. For example, if there is a national team match or international tournament happening, then there would likely be more teams involved.
Overall, while I don't have real-time information about the current game being played, I hope this information helps give you some insight into how many teams are playing today!