It's easy i just need one controller,
Fisrt,
Configure your gamepad to be the player 1 after configure the keyboard for player 2.
Second,
Choose your team with keyboard and gamepad. After make the line change if you want and after your are ready to play the game change the configuration of the player 2 to your gamepad and after you control the two team.
If you want see the result here me video i made with this :https://www.youtube.com/watch?v=IXx-omimUKM