Concussion can be difficult to diagnose or detect in the heat of competition. Osborne recommends parents monitor for concussion symptoms as much as possible. Asking your child if they are okay multiple times during the day or night after collisions or other causes of head trauma and monitoring them for effects of concussions is an important way to make sure they are safe.
Here are more links to the Seminar
Palatine Celtic Soccer - Concussion Seminar Part 2 - Dr. Beth Pieroth North Shore Health