Stepan suffered a broken jaw in Game 3 Thursday night after being rocked by a late hit from former teammate Brandon Prust -- a hit that later earned Prust a two-game suspension from the NHL's Department of Player Safety.
The 23-year-old Stepan underwent surgery Friday night to repair his fractured jaw and was discharged from the hospital Saturday. He came to the rink Sunday morning to greet his teammates, Vigneault said, but will not be in the lineup when the Rangers host the Habs at Madison Square Garden for Game 4.
It is not clear when Stepan will be ready to return.
"He's recovering at home and there is no timetable at this time," Vigneault said.
Stepan has three goals and 11 points in 17 games this postseason for the Rangers.
On Saturday, Prust said he felt "awful" for the hit and reached out to his friend via text to apologize.