The Trainwreck star faced off against Seth Rollins during the weekly World Wrestling Entertainment (WWE) Monday Night Raw event, but fans were given a shock as Cena took a knee to the face.

Blood dripped from his broken nose, but the wrestling icon refused to give up, despite clearly appearing a little dazed, and battled on to successfully defend his United States Championship title.

After the fight, Cena was hospitalised for treatment.

WWE doctor Steve Daquino explained, "John suffered from a nasal fraction. He's got quite a bit of displacement, so we sent him over to the local emergency room so he can be evaluated by the ears, nose and throat doctor who's on call tonight and see what can be done to properly repair it."

Cena has yet to comment on the injury.