"The fact that he's now skating with us … he's going to be back," Treliving said. "He's going to be back playing. It's just a question of when now. Medically he's improved to the point where we think he's -- with that type of situation, you're always scared to say he's over it.
"But at this point, he's proved that he's moved past it. Now it's a matter of getting him up to speed. He's missed a lot of time."
Stone's return will give the Flames more flexibility on defense.
"One way you look at it is that it gives us more depth. It gives us another option at some point," Treliving said. "It may be a little bit of time here before he's up to playing games. He's an NHL defenseman, right shot, who has experience. At this time of year, you can never have too many guys on the blue line."
The Flames (37-16-7) lead the San Jose Sharks by three points for first place in the Pacific Division and the Western Conference following their 4-2 victory against the New York Islanders on Wednesday.