It sounds like this is a question of what the consequence of pushing would be because pushing is pushing, no matter what you are doing. A successful push in soccer i.e. placing hands or fists on an OPPOSING player and extending the arms to full length will result in a penal foul, which gives a free kick to the victimized team. Depending on the situation, a player may be yellow carded or red carded by the referee. There is a way to steal the ball by "pushing" the opponent off of the ball with your body, but this is more of a "shoulder-to-shoulder" action and any use of the arms becomes a push, which is illegal.
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