The phrase "possible concussion" means there is a chance that someone might have a head injury called a concussion, but it is not yet confirmed. Full definition
UNCs stand on catty - corner 25 - yard lines during NFL games, watching for possible concussions and assisting team physicians in evaluating players. (sbnation.com)
Depending on athletes to admit to experiencing concussion symptoms doesn't work due to chronic under - reporting.1 Likewise, studies show that coaches and athletic trainers can't be counted on to reliably identify athletes exhibiting signs of possible concussion for screening on the sports sidelines, especially since only 5 to 10 % of concussions involve a loss of consciousness and the onset of concussions symptoms is often delayed, especially in younger athletes. (MomsTeam.com)
A revolutionary new product called ShockboxTM triggers an alarm on a smart - phone whenever an athlete suffered a blow to the head hard enough to cause possible concussion so the player can be immediately removed from the game or practice for a sideline assessment. (MomsTeam.com)