If he has a defect or anomaly, it might come out.
If so, no college or pro ball.
I notice that a lot of these athletes have a habit of pounding their chest when they make a goal, good shot , tackle, etc.
That itself could stop their heart if it coincided with a heart rhythm point that is at the low part in the cycle.
Kids that have been hit by baseballs in their chest have had heart stoppages......Rare, but it happens.............