Pittsburgh Steelers quarterback Ben Roethlisberger is battling injury which coach Mike Tomlin means they will need to be "adjustable" for Sunday's Week 3 game with the Cincinnati Bengals.

The Steelers veteran was hit 10 times and sacked twice in Pittsburgh's 26-17 loss to the Las Vegas Raiders in Week 2.

Roethlisberger was also sacked twice in the Steelers' 23-16 win over the Buffalo Bills in Week 1.

The 39-year-old is nursing a left pectoral injury which will impact his preparation for the Bengals game, and potentially his on-field role.

"We'd better be ready to be adjustable," Tomlin told NFL Network.

"He took too many hits. We can run the ball better. We can get the ball out of his hand quicker.

"We can stay on schedule and not get behind the sticks and get in situations where the line of the game is so far that that that enhances the rush."

Tomlin added that he was unsure how Roethlisberger picked up the pec complaint.

"I don't know specifically when Ben got injured in game. I don't know that he does," he said.

"Sometimes just in the midst of competition, adrenaline and so forth, you just don't know. Sometimes things just come up after."

The Steelers have numerous injuries including T.J. Witt, Alex Highsmith, Devin Bush and Joe Haden.