It took less than a quarter for Ben Roethlisberger to be pressed into action for the Steelers.
On the Steelers' first drive, backup Landry Jones injured his left ankle and was forced to leave the game. He was carted off after the Steelers settled for a field goal.
Roethlisberger, who left with a mid-left foot sprain in the fourth quarter of last week's win over the Oakland Raiders, was wearing a custom shoe.
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Roethlisberger missed four games last month with a sprained left knee after being injured Sept. 27 in a win at St. Louis.
The Steelers were 2-2 without Roethlisberger, winning two of three with Mike Vick starting before he injured a hamstring.
Jones lost his first NFL start to the Chiefs at Kansas City on Oct. 25 but came off the bench to rally the Steelers to wins over the Arizona Cardinals with two second-half touchdowns passes on Oct. 18 and Oakland last Sunday, when they drove 79 yards in seven plays for Chris Boswell's deciding 18-yard field goal with two seconds left.
Jones threw two interceptions and lost a fumble in his first start. However, he said the lesson he learned in that loss is to keep things simple.