The defenseman left in the second period of a 4-3 overtime win against the Philadelphia Flyers on Monday.
"He'll be out for a while," Hurricanes coach Rod Brind'Amour said Thursday. "Did something in his midsection and it's going to need time to heal. It's a tough blow because he's obviously been a big part of what's going on. … I think probably more like a month, somewhere in there. It's long term so it is what it is."
DeAngelo leads Carolina defensemen and is tied for third with forward Teuvo Teravainen among Carolina players with 40 points (nine goals, 31 assists). DeAngelo scored 16 power-play points and his plus-19 rating leads the Hurricanes.
"It's going to affect us a lot," forward Vincent Trocheck said. "He's a great hockey player. Huge for our power play, and 5-on-5. Pretty much in all aspects of our game he's been really good for us and he brings another component to our team that has kind of taken us to the next step offensively, so we're going to miss him a lot.
"We have a lot of depth on 'D,' I think we have one of the deeper D-corps in the league, so it's next-man-up mentality."
Defenseman Jalen Chatfield was recalled from Chicago of the American Hockey League on Wednesday. He had one assist in seven games with the Hurricanes this season and scored 11 points (five goals, six assists) in 30 AHL games.
"I haven't really gotten too much into detail with how long [DeAngelo] is going to be out, " Chatfield said Thursday. "It could be long term or whatever, but I'm just going to take it game by game and just give it my all out there."
The Hurricanes host the Columbus Blue Jackets on Friday.
