The 38-year-old forward, who said Sept. 2 he was taking time away from the NHL, signed a one-year, $700,000 contract with Carolina on Tuesday.
"I'm a realist," Williams said after practice. "I need time, and fortunately for us we have that. And whenever that time is, I'm sure [coach Rod Brind'Amour] will let us know."
Brind'Amour said after practice he doesn't envision that return anytime soon and that he hasn't considered how the lineup will look when Williams is ready.
"There's no point in bringing it up because he's not an option," Brind'Amour said. "Whether it's a week, two weeks, when we get to the point where I feel like he can play then I'll have to make some decisions, if that's the case, but … it's not around the corner for us.
"We're taking it really slow here, to make sure it's the right time."
When Williams does return, it will begin his 19th NHL season. He has 786 points (312 goals, 474 assists) in 1,244 NHL games with the Philadelphia Flyers, Hurricanes, Los Angeles Kings and Washington Capitals.