He has also spent a month studying the Roosters' style of play, taking notes in video sessions while in quarantine and in person.
Tedesco said he has no doubts about Williams' fitness and ability.
"He's probably not as fit as he was when he was in his 20s, but skilfully he's still got it with more skills," he said.
"That's the big thing for us this week working on some combinations and getting that going on the field.
"Going off what I have seen he looks physically ready to go."
Earlier this month when asked if he could still put a decent shot on, Williams was quick to offer a reporter a chance to find out for himself.
"You want to run at me, cuz?" Williams laughed.
"To be honest, I've been watching a lot of footy lately and these young lads are just big boys. Big and fit and strong and fast, so we'll see how we go."
He said he was expecting to be targetted by the opposition, such is the nature of the game.
"I haven't played for so long, so it's just common sense really. But at the same time, I've been around for a long time and hopefully I can bank on a bit for that experience to help me out there - and maybe push the boys in to do some of my tackling if I do get a chance."
