give the nature of that criminally viscous hit (that's how I'm going to refer to it), it's a miracle that the question you pose can be a possibility. Given how he looked post game (great), given he was cleared not only on the field to walk off but checked out at the hospital with xrays, etc they can now observe him for a few days this to be sure no other potentially serious issues emerge.
Now luckily and amazingly, It is a possible outcome that this may be more of a neck sprain issue and less head based on how the injury occurred with luckily the idiot not using the crown of his helmet and how it slid off instead of driving through dungys helmet. And again how his neck snapped back. The anatomy of the neck allows for this motion more so than if it went in the other direction in forward flexion where serious injury is more likely. It is still possible for serious injury but less likely.
If nothing else develops in the next few days and it's not a diagnosed concussion (meaning he passes all the diagnostics this week including concussion testing/evaluations) and it is more the neck as mentioned then there's actually a chance he plays this weekend. There's some hope at this point that he dodges a bullet most importantly and then we get to see him lead a historic upset of LSU.