Maybe it is a good suggestion, but what about a Select Team menu.
First you’ll be in the ‘Choosing’ team, which means that the player is choosing a team.
There, you’ll see the available teams with an image of the team, and you can select a team you want to be in.
The available ones will be colored, and the grey ones are the ones you can’t select.
I have seen this before, and it’s a really good thing to have.