Ben leaves the field after being injured against the St. Louis Rams in the third quarter at the Edward Jones Dome. Michael Vick went in the game under center for the remainder.
The Steelers kept their lead, 12-6.
From Coach Tomlin:
“The MRI on Sunday night revealed Ben Roethlisberger had an MCL injury to his left knee. There is no timetable for his return, but Ben is a competitor and we are confident he will do everything in his power to return at the appropriate time.â€