WWE star Seth Rollins has confirmed that he will be out of action for a while after picking up a knee injury during Saturday Night’s Main Event.Rollins, who has been enjoying a strong run in WWE lately, shared the update during an interview on the Rich Eisen Show.The injury happened during a match with LA Knight, when Rollins landed awkwardly after attempting a moonsault. He felt his knee buckle and knew something was wrong, though he was able to finish the match.Seth Rollins has since had scans and treatment in Birmingham, Alabama, but the swelling in his knee has made it difficult to get a clear diagnosis.