Gaborik came off the ice after the first period and after talking to the team's training staff told coach John Tortorella he would not be able to continue.
Tortorella said he did not know when Gaborik sustained the concussion but alluded that it may have happened before Sunday's game.
"I know he's had some conversations off the ice that he wasn't dead on," said Tortorella. "But that's something we're going to have to talk to him about and just see."
While the team does not know how long they'll be without Gaborik, Tortorella believes the team will call up players from its AHL affiliate in Hartford for the upcoming road trip to Carolina and Washington.
Gaborik's production is down this season with 17 goals and just one in the month of February. The fast-skating wing posted 42 goals in 2009-10.
Gaborik missed time earlier this season due to a shoulder injury, and was benched in mid-January in the midst of a scoring slump.
Mike Hume is a contributor to ESPNNewYork.com.