Domi participated in practice Monday for the first time since the NHL started Phase 3 of its return to play plan a week ago.
Domi has Type 1 diabetes and celiac disease. He and the Canadiens had agreed on waiting seven to 10 days before making a call on whether he would return in the midst of the COVID-19 pandemic.
"It was really good to see (Domi) today," Montreal goaltender Carey Price said. "He brings a lot of enthusiasm to our locker room and on the ice.
"He’s a vocal guy and he’s got a unique laugh that everybody loves to hear."
Domi had 17 goals and 27 assists in 71 games this season.
The season is scheduled to restart with a best-of-five qualifying round beginning Aug. 1 in Toronto and Edmonton. The Canadiens will face the Pittsburgh Penguins in Toronto.