World Cup - Williams confirms Cardiff farewell
Speculation had been circling the 34-year-old, who has 86 caps to his name, would call it a day following Wales' impressive display at the World Cup. But Williams confirmed he was keen on saying goodbye in front of the Wales fans.
He said on Wales Online: "I've decided I am going to make myself available for this game. If selected, I want to play."
He continued: "If I am picked I will treat it in the same way I have always treated Wales games, but it will be a sad day for me. In fact, I'll be devastated.
"But to bow out in front of Welsh fans and my family and friends would be like a dream."
Williams will continue to play for Ospreys after calling an end to his international career.
He said: "I always said I would know in myself when the time came to stop playing for Wales and that time is very nearly upon me.
"After this last game in December, that's definitely it for me, there'll be no changing my mind."
Williams is a former IRB world player of the year and his country's record try-scorer.
December's game will be a rematch of the third-place play-off at the World Cup in New Zealand, which Australia won.