Williams received both cortisone and platelet rich plasma therapy in his ankles, something he underwent last year as well. He will be re-evaluated later this week.
According to this official press release, Deron had a cortisone shot in the ankle joint of his sprained left ankle, and platelet rich plasma (or PRP) injections in the lateral ligaments of that ankle. His right ankle is not sprained, but he had injections of cortisone and PRP in that ankle as well to reduce inflammation.
Williams will wear a walking boot on his left leg until he's re-evaluated.