Take him out. Just because he feels fine now doesn't mean everything is 100%. Many injuries or problems may show up later such as concussions, which may not seem to show after injury.
Answer:
You should tell the coach to take him out anyways. The effects of the hit may not show instantly, and due to where the ball hit him and how hard the impact was, it’s likely he will have some sort of concussion effects after the game.
