New Zealand begin their Rugby Championship defence against Australia next weekend and Williams, 32, is keen to be involved but he accepts he will have to fight for an All Blacks starting spot.
Williams played 65 minutes on a very different stage from what he has become accustomed to at the small South Auckland rugby club, a week before he could do battle with the Wallabies in the Bledisloe Cup opener in Sydney.
Williams received a red card in the second Lions Test for a shoulder charge to the face of Anthony Watson, and was banned for four matches as a result - a ban that expired after Friday's "Game of Three Halves".
"Hopefully I put my best foot forward now and I have to train hard and hopefully get up for selection".
Sonny Bill Williams makes successful return to rugby for Counties B
"It was great to get out and play the game I love and get back to some grassroots footy", Williams said post-match. We leave tomorrow to go to Sydney, which is my second home.
"I don't know how often the fields get looked after but it was pretty tough conditions out there".
"You chuck a bit of deep heat on before the game and you're ready to go".