During Cincinnati's 71-yard drive that ended with a disastrous redzone interception midway through the first quarter, Bengals tight end Tyler Eifert contributed with an 18-yard grab and then converted a third-and-10 during a 24-yard screen pass to the Steelers' six-yard line with 6:20 remaining.
Eifert didn't return after the play.
The team announced Eifert is undergoing the league's concussion protocol and has been declared out.
Cincinnati also announced that starting safety George Iloka is doubtful to return with a groin injury. Iloka didn't practice Wednesday or Thursday and missed last week's game with the same injury.