Williams remained on his back after the play in the closing seconds of the second quarter.
Medical personnel tended to Williams on the field for several minutes before putting him on a stretcher, then on a cart. Williams gave a thumbs-up signal while being placed on the cart, then extended his right arm high and flashed a Wildcats sign.
Williams was pursuing Arkansas quarterback Tyler Wilson, who ducked to avoid being hit. Williams then made contact with linebacker Emmanuel Lamur, who was coming from the other side.
There was no immediate word of Williams' specific injury or condition.