(CNN) - A helmet-to-helmet collision left Pittsburgh Steelers quarterback Mason Rudolph unresponsive and later diagnosed with a concussion Sunday.
As Rudolph let off a pass down field against the Baltimore Ravens, a defender's helmet smacked right into his.
Burt Lauten, a Steelers spokesman, tweeted Sunday Rudolph wouldn't return to the game.
"Rudolph is leaving Heinz Field to be further evaluated at a hospital," Lauten tweeted.
Now that Rudolph is out, the Steelers will look to Devlin Hodges who was promoted from the practice squad after Roethlisberger was put on the reserve/injured list, according to the Steelers' website.