UPDATE: LeSean returned to the game in the 3rd quarter.
LeSean McCoy had an incident towards the end of the first half of the Eagles and Chiefs game, and it did not look good. LeSean got his leg rolled on by a defensive player and remained on the ground for a while. Luckily, he got up shortly after and jogged off the field directly to the locker room for x-rays.
According to Alex Flanagan of NFL Network, McCoy was stoic as he left the playing area, but then showed emotion once he was through the tunnel.