Powe flipped over the Capitals' Matt Hendricks in an open-ice collision that hurtled him to the ice head-first and left the versatile fourth-liner shaken.
Powe was down for several minutes while receiving medical attention from the team trainer and, unsurprisingly, did not return to the game. Rangers coach John Tortorella did not have an update on Powe's condition after the game.
With Powe's status tenuous at best for Tuesday's game against the Montreal Canadiens, the Rangers will likely keep 22-year-old Chris Kreider up with the team. After being sent down to the AHL on Friday, Kreider was recalled one day later as a precaution in case a "banged up" Rick Nash was unable to play.
Now it seems Kreider will be sticking around a bit longer, although Tortorella said they will re-assess the situation on Monday.