“It’s too soon to pick out any one thing I’ve gained from working with Ronald Koeman, but he is one of the best centre-halves who ever played and I am going to be a sponge to learn from him and try to take in as much as I can of his knowledge.
“Ask me later in the season and I hope I’ll be able to tell you more, but right now I am trying to settle in and find my way into his system.”
Williams revealed that Wales boss Coleman began this camp by showing the players a highlights clip of their summer European Championship adventure in France, when the side ended 58 years of trying to reach a major tournament by going all the way to the semi-finals.
But he said: “It was great to relive some of those memories, but the message when it finished was that it was time to move on.
“It was great to acknowledge what we did, but it was also important to put it to bed and focus on this campaign because we all want to get to a World Cup.”