Jones began his career with Llanelli more than 15 years ago and returned to West Wales in 2006 after a two-year spell with Clermont and Williams believes his staying power must be lauded ahead of the weekend's clash.
"I'm not sure if he will be playing 10 or 12 or he could even play 15 - you never know with Steve - but it's going to be an emotional occasion for him," said Williams.
"Although he had a brief stint in Clermont, it's where he has played most of his career.
"He should go down as one of the legends of the Welsh game.
"He's been unbelievable since he's been playing [in] one of the most difficult positions anyone can in Wales, the number 10 jersey.
"To go on and become the most capped player of all time in Wales is an unbelievable feat. As he is on and off the field, he's a great influence and an unbelievable role model for anybody."
63x46.png){kind=logo}