The Jets placed CB Darrelle Revis on injured reserve with a torn left ACL on Friday and signed S Antonio Allen from the practice squad.
Revis suffered the injury in Week Three, but didn’t immediately go on I.R. because of the slim chance he could be healthy by the Super Bowl.
"I know I had said before about Darrelle that I'd like to wait for him to have surgery before we placed him on I.R. or not," Rex Ryan told reporters on Friday. "Unfortunately with that time situation, you've had Eric Smith being out this week, we're going to need that roster spot."
Smith injured his knee in practice on Thursday and will not be available for Sunday’s game against the Colts.
Allen was a seventh-round pick by the Jets in April.