Neither flanker Williams, who has 99 caps to his name, nor Jones featured in Wales' Grand Slam winning RBS 6 Nations campaign but both could well feature against the Barbarians this summer.
And Williams believes Jones ranks up there with Welsh rugby legends such as JPR Williams and Gareth Edwards.
"He should go down as one of the legends of the Welsh game," he said.
"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.
"To play 104 games for Wales at outside-half just speaks for itself and just shows what kind of character he [Jones] is on and off the field.
"It's a shame he's leaving Wales and not plying his trade in Wales but I suppose it's Wasps' gain.
"Full credit to him, he can definitely play for another two or three seasons and I'm sure he will be a success there as well."