Tkachuk sustained the injury in practice Wednesday.
"It was kind of just an accidental thing in practice," he said. "Everyone was kind of in the crease and I caught a skate."
Tkachuk, the No. 6 pick in the 2016, has three goals and six points in 12 games this season.
"It looks like he is. It looks like he is just with his skate today," Flames coach Glen Gulutzan said. "I haven't talked to the guys after to see how he felt, everything like that.
"But he looks like he is.
"That's encouraging. He said he wasn't having any problems. Until I talk to those guys and they tell me where he's at after the practice then I'll know. But it's a good sign when anyone's practicing."
The Flames are already without a few forwards.
Kris Versteeg has missed four games because of a groin strain sustained in a 3-2 win against the San Jose Sharks on Nov. 3, and Lance Bouma has missed three games after sustaining an upper body injury in a 5-0 loss at the Los Angeles Kings on Nov. 5.
Calgary could be without Linden Vey, too, who was hit with a slap slot late in the Flames' 4-1 loss against the New York Rangers on Saturday.
"Right at the end," Gulutzan said. "He had a look at his arm today, but we'll see in the morning how he is."
