The Washington Capitals are in the heart of the NHL season, which means their key players have logged plenty of minutes and the injuries continue to take a toll.
While the injury is not expected to be severe, head coach Barry Trotz is not going to rush him out and Niskanen could end up being held out of the Capitals' Friday home game against the Oilers.
As a precautionary measure, the team called up Hershey Bears defenseman Aaron Ness on Thursday afternoon.
Ness has scored five goals and registered 11 assists in 41 games with Hershey this season. Ness was previously recalled in December when Niskanen sat out with a minor injury, ending his lengthy consecutive games played streak.
Ness appeared in eight games last season, registering two points.
In addition to the call up of Ness, the Capitals also called up 23-year-old Riley Barber. who was tabbed as the 2015-16 Hershey Bears Rookie of the Year. Barber replaces Brooks Orpik, who Trotz is giving time off to for "maintenance."
The Capitals host the Oilers on Friday night at 7:00 p.m. on CSN Mid-Atlantic.
RELATED: UPDATED CAPITALS PROSPECT REPORT