So I assume that someone with sickle cell trait would be cleared to play football with little or no extra risk. It still seems to me that coaches should be on the look out for dehydration symptoms, and that someone with sickle cell trait would be more susceptible. It’s too early to make conclusions, either to assume a medical problem, or to clear the coaches.
Many black athletes have Sickle Trait and play sports all their lives. It is rare for there to be problems but it does happen. An early symptom is leg cramps. Not all cramps are Sickle Trait6 related though.
I am sad to say that my school lost a promising young athlete in 1985 due to Sickle Trait. FSU lost one a few years back.