Although he would not reveal much, Williams did say that training Damon has "been easy".
"I have been very fortunate to be training such a professional person in the game such as Matt Damon. He has a yearning to learn how to play, and has a clear understanding of the importance of the game as well," he said.
"It’s been an honour and a privilege for me to be part of such a great film that will show how Madiba and the game managed to make such an impact on the country. It’s been a great time for me,” Williams said.
Later this year he'll be sees in Paul Greengrass' new film Green Zone, about the hunt for WMDs in Baghdad after the American invasion. "Paul is a remarkable director," he says. "He just has an immediacy on the set. He doesn't come in with a prearranged agenda of how things are going to go, and he's always chasing something that's not easily found. It's his own journey as a filmmaker, but I think everybody feels like you want to give him everything you've got, because the thing that he's searching for always translates to the screen, always creates these pictures that feel very vibrant. He has a way of making even smallest moments really big and lifelike on screen. It was wonderful."