Looks like this situation may be salvageable after all.
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Seth Rollins' status for WrestleMania 33 in Orlando was put in serious doubt when he suffered a knee injury last week, which has later been revealed to be a torn MCL. While the news of the torn ligament is bad news, the good part is that WWE is still expecting Rollins to be ready for his planned match with Triple H at WrestleMania.
From Dave Meltzer of the Wrestling Observer: (subscription required)
Seth is considered good for WrestleMania. So Triple H and Seth is on, that's what they're working towards, and maybe that's why they didn't tip their hand. But they are going with the idea that that match is still on and he will be ready for WrestleMania.
The match with Triple H is expected to be one of the marquee matches at this year's WrestleMania, so it is good to hear that WWE isn't expected to have to scramble in their plans to make up for the injury. Last year's WrestleMania was marred and changed greatly due to multiple wrestlers getting injured at the wrong time, so it would be nice to have this year's big show largely unaffected by afflictions.