The news was first reported Monday by Columbus Dispatch writer Shawn Mitchell.
If the timeline on the injury is accurate, Umberger won't return this season unless the Blue Jackets qualify for the Stanley Cup Playoffs. They have four games remaining, and currently lead the New Jersey Devils and Toronto Maple Leafs by three points and the Washington Capitals by four points for the second wild-card spot in the Eastern Conference.
Umberger had been a healthy scratch several times in recent weeks. He scored 18 goals and 34 points in 74 games this season.
We want to make sure that whoever makes our team really makes our team by earning it and not putting them in situations where they get preference because of their status as a first-round pick or whatever it might be. That's not going to happen. Everybody has to earn their way on our team.
— Columbus Blue Jackets general manager Jarmo Kekalainen on the team's prospects at development camp