I have one of my players who finished an injury at 11:33 p.m. so I started training around 11:36 p.m. and the player did not participate in training due to injury even though he was no longer injured

what is his physical?

100% he didn't do the training

did you sign him recently ?

no I've had it since last season

There is always a delay of a few minutes before the injury is no longer effective.