Powe remained down on the ice briefly after the hit as play went on.
Powe was woozy after striking his head on the ice and didn't return to the game.
The 27-year-old Powe has yet to record a point in eight games this season.
He and fellow injured forward Daroll Powe, who like Clowe might have a concussion, didn't skate Saturday.
The Rangers were without injured forwards Rick Nash, Arron Asham and Darroll Powe, and defenseman Michael Del Zotto.
The Rangers said in between periods that Powe's return was questionable, but he didn't get back onto the ice.
Darroll Powe rejoined the lineup after missing three games because of a concussion.
Rangers forwards Darroll Powe and Arron Asham were on that Philadelphia team that stunned the Bruins with an epic comeback in 2010.
He went through battle drills in practice on Tuesday, and might be able to rejoin the lineup in Powe's place on Wednesday.
With Kris Newbury sent to the minors on Sunday, Rangers C Darroll Powe returned to the lineup after sitting out three games.
Nick Powe, managing director of Kents Cavern, also helped with the bid.
The Rangers said in between periods that Powe's return was questionable.
Rangers C Darroll Powe was helped off the ice by teammates Arron Asham and Stepan after a center-ice collision with Washington's Matt Hendricks in the second period.
They were without forward Rick Nash, who was given a "maintenance day, " and Darroll Powe, who was injured on Monday and is unlikely to play in Game 4.
Outside of Powe's injury, the Rangers continue to get healthier.
Rangers forward Ryane Clowe (suspected concussion) remained out, and New York also lost Darroll Powe in the first period when the forward was elbowed in the head by Washington's Joel Ward.
They took the places of Nash and center Darroll Powe, who was placed on the injured list Monday after sustaining a concussion during a collision with Washington's Matt Hendricks on Sunday.
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