Indianapolis Colts quarterback Jacoby Brissett briefly left Sunday's game against the Steelers with a potential head injury, but was able to return to the field after being cleared by team and independent doctors.
Coach Mike Tomlin said after the game that Haden broke his fibula and is out indefinitely.
To date, Brissett has thrown for 2,172 yards, nine touchdowns and five interceptions.
Roethlisberger found JuJu Smith-Schuster on a 7-yard TD pass midway through the third quarter to make it 17-9. Roethlisberger's conversion pass to Martavis Bryant tied the score at 17. "We're fortunate to win this game giving up those two long touchdown passes".
The Colts dominated for the first half of the game but failed to secure the 14-point lead they owned at one point in the second half.
He had an extra point blocked that was almost returned for two points by Colts safety Matthias Farley.
Pittsburgh finally got on the board with 30 seconds remaining in the half on Boswell's 41-yard field goal.
The independent neurologist was evaluating Colts' defensive back Kenny Moore II at the time and was not available to check out Brissett.
Colts: Brissett did not come to the podium after the game because he developed concussion-like symptoms following, the Colts said.
Steelers: Host Tennessee on Thursday night, their first home game since October 22.