Surely there are several choices, starting with just the fans, which would probably be close enough in many contexts. For those in the stadium you could also say the crowd or the spectators, or for those watching the game on TV, the viewers, or (more formal/technical) the viewing audience.

With a complete example sentence, it might be easier to say which sounds better in a particular context.

okay, danke euch allen :) Das hilft mir weiter.