"It's a pretty significant injury," coach Pete DeBoer said.
"Our top two centers are out. It's a big loss. They're big pieces of our team," Ilya Kovalchuk said. "But look at Pittsburgh. They're missing big guys."
Josefon's injury further hurts the Devils center depth, and could force the club to acquire another center. One of the more likely scenarios would have the Devils re-call Adam Henrique from the AHL.
Henrique, the 82nd overall pick in the third round of the 2008 entry draft, played two games with New Jersey before being optioned to the Albany Devils. He has one assist in three games played in Albany.