Colliton didn't provide details on Toews' health status, as NHL teams are prohibited from sharing medical information on players as part of the collectively bargained return-to-play agreement amid the coronavirus pandemic.
"The term we're being asked to use, kind of as a blanket, is ‘unfit to participate,'" Colliton said.
"Nothing new on Toewser. He's unfit to participate. That's how I have to leave it."
The 12th-seeded Blackhawks are scheduled to leave for Edmonton on Sunday for their best-of-five qualifying-round series against the fifth-seeded Oilers. The team is still finalizing its roster for that series, which begins Aug. 1.
Toews, 32, played in each of the Blackhawks' 70 regular-season games this season, recording 18 goals and 42 assists.