Seth Rollins was mentioned to have an MCL tear on Monday, but not much else.
As revealed on the Fightful.com Wrestling Podcast, WWE is staying quiet about the prognosis of Rollins' return, because the knee injury could place him out from a few weeks, all the way up to two or three months. Fightful.com was told late during Raw that the company doesn't want to announce that Rollins will be good to go, only to have him face a setback and miss WrestleMania, but they're optimistic the match will happen.
A grade one MCL tear can put you out of action for a couple of weeks, but a grade three can have someone sidelined well over two months if there is any damage associated with the ACL. It was noted on other sites that Rollins flew back to Birmingham this weekend, but one person we spoke to isn't sure he actually left Birmingham to begin with.
WWE is also covering its bases, having color commentator Corey Graves mention that Rollins may not make it back in time for the show as a double-edged tool, to play up the unpredictability while still warning viewers that the former WWE Champion might not be wrestling on the show.
Fightful.com will have more news on the story as it develops