"We don't believe it will be long term," head coach Bruce Cassidy told reporters postgame, adding the forward will be a game-time decision for Saturday's Game 3, per NBC.
Pastrnak tallied one goal and one helper while playing nearly 25 minutes in Boston's Game 1 overtime victory. However, he appeared to be laboring while celebrating Patrice Bergeron's OT winner.
The 24-year-old tied for the NHL lead with 48 goals this season.
The Hurricanes evened the series at one game apiece with a 3-2 win on Thursday.