WALTHAM, Mass. -- Boston Celtics second-year big man Kelly Olynyk wore a protective boot over his sprained right ankle while meeting with reporters after Thursday's practice and said he's uncertain when he'll resume basketball activities while waiting for pain and swelling to subside.

Chris Forsberg/ESPN Boston

Kelly Olynyk sported a boot at Thursday's practice.Olynyk injured the ankle when he landed awkwardly on the foot of Portland's Thomas Robinson chasing a rebound in last Thursday's win over the Trail Blazers. Olynyk returned home from the team's extended road trip for further testing and could be sidelined until late February, especially with an extended All-Star break looming next month.

"It’s tough with something like an ankle, everyone is different," Olynyk said. "It could be a week, it could be three weeks, it could be a month -- you never know. I'm just trying to get better and evaluate it each day and take the next step whenever it’s deemed necessary."

Olynyk said he has immersed himself in treatment.

"Lots of stuff -- you’d probably have to talk to [team physical therapist] Todd [Campbell] or [team trainer] Ed [Lacerte], they can tell you better," Olynyk said. "It’s almost treatment overload, just trying to do whatever you can to keep that swelling down, get the pain out of there and try to get it moving as best we can."

Olynyk admitted the injury was "pretty painful" and he realized soon after landing that he couldn't put any pressure on it as he limped off the floor. Pain lingered into this week, but Olynyk believes he is progressing.

The 23-year-old Olynyk was recently voted into the Rising Stars Challenge at All-Star weekend, earning a spot on the World roster in the league's modified rookie/sophomore showcase. The Canada native said he'll wait to see how he progresses before deciding if he can participate in the event and said he hasn't considered whether he'll attend All-Star weekend in New York if he's unable to get on the court.

Olynyk, who played in the Rising Stars game last year as a rookie, said he was honored to be voted in again by the league's assistant coaches given the surfeit of young talent in the league.

Olynyk is averaging 11.1 points, 5.4 rebounds, 1.7 assists and 1 steal over 24.5 minutes per game in 40 appearances this season. He missed 10 games last year with an ankle sprain and said that process will help him gauge when he's ready to return to action this time around.