I played a league game against a guy who played a 3-5-2 formation the whole game and I won possession 80-20. He didn't have any injuries in the game and the manager never came to the game. I think this is a neglected team since he has a lot of money and is only a 2 star team. He plays a GK in goal, but also plays GKs as a ST and ML.

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Does that cause the formation to be illegal?