Williams was not touched by another player as he was fielding a punt in a return drill when his leg buckled somewhat. He then let out a scream as he fell to the ground. He was taken to the locker room on a cart.
“It’s his Achilles," Broncos coach Gary Kubiak said following practice. " … He wasn’t even touched; just feel bad for him. I know he’s disappointed."
Williams will undergo additional tests, including an MRI. Williams posted on Instagram on Saturday he would miss the season because of the injury.