Noah Hanifin will be out indefinitely for the Carolina Hurricanes because of a concussion.
The 21-year-old defenseman left the third period of a 4-2 loss to the Philadelphia Flyers on Saturday and did not travel with the Hurricanes for their 4-3 win at the New York Islanders on Sunday.
Hanifin has 29 points (eight goals, 21 assists) this season and hadn't missed a game prior to Sunday.
Video: CAR@DET: Hanifin goes top shelf on Howard
The Hurricanes (31-30-11), who host the Edmonton Oilers on Tuesday (7 p.m. ET; FS-CR, SNW, NHL.TV), are nine points behind the New Jersey Devils for the second wild card into the Stanley Cup Playoffs from the Eastern Conference.
Forward Valentin Zykov was recalled from Charlotte of the American Hockey League on Monday. He leads the AHL in goals (32) and is ninth in points (52) in 61 games.