Ben Roethlisberger's status after he left Tuesday's practice is no longer a mystery.
"Ben Roethlisberger sustained a hit today in practice," Tomlin said. "He is being evaluated by team doctors as part of the concussion protocol."
Roethlisberger went down during a 7 shots segment of practice, according to multiple reporters on the scene.
Roethlisberger was briefly on the ground before eventually getting up. He then spent time talking to a team trainer and general manager Kevin Colbert before leaving the field under his own power, Ed Bouchette of the Pittsburgh Post-Gazette reported.
The Steelers are scheduled to play the Green Bay Packers in preseason action Thursday night, and Tomlin told reporters before Tuesday's practice that Roethlisberger would be among a group of starters not expected to suit up.
With the starting quarterback now being evaluated in the concussion protocol, Roethlisberger will have extra time to recover before the regular season, which kicks off in less than a month.