According to WWE.com, Seth Rollins re-injured his knee during an encounter with Samoa Joe at the conclusion of WWE Raw.
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Pro Wrestling Sheet also reports that Rollins' WrestleMania status is "up in the air" as he awaits meeting with a doctor this week.
Rollins tore his right ACL in May of last year:
And it's the same leg that appears to buckle as Joe is taking him to the ground.
https://twitter.com/WWE/status/826812973368954880
According to the report, producers are exploring other options if Rollins is injured, as he was expected to face off against Triple H at the big event in Orlando.