John Cena suffered a left knee injury on this week's episode of Monday Night Raw. The injury occurred while working with The Wyatt Family on a spot with Erick Rowan. Rowan lifted Cena on a takedown and as soon as it happened, a ringside medic checked on Cena. Cena grabbed his knee and went to the apron but waved off further medical attention. He got back up with the help of the ropes, visibly limping, and sold a clothesline from Bray Wyatt.
When the show came back from commercial, Cena was being loaded on a stretcher and wheeled to the back. A camera shot appeared to show swelling in Cena's knee. On commentary, Jerry Lawler shifted the discussion to Cena's knee and JBL questioned his status for Wrestlemania XXX. That's a valid question but no one wants to ask at this point.
You can watch where the injury occurred at the 2:55 mark in the video below: