Pittsburgh Penguins forward Jason Zucker will be out of the lineup week-to-week, according to Head Coach Mike Sullivan.
Zucker left Monday's game against the Dallas Stars for a time, but returned to the ice in the 2-1 victory.
Sullivan says that Zucker's injury will not require surgery.
Defenseman Jeff Petry is out longer-term is an upper-body injury.
Forward Drew O'Connor and defenseman Mark Friedman, recalled from Wilkes-Barre/Scranton, were at practice on Wednesday.
Zucker will not join the Penguins on their road trip to Florida and Carolina.
The Penguins then have two games at home before a Christmas break.
The second-line winger has six goals and 14 assists this season.
Zucker has already missed some time this season due to injury and has been dealing with injuries over the past two years.
