Porter was on the field after Steelers wide receiver Antonio Brown took a vicious hit to the helmet from Bengals linebacker Vontaze Burfict. Porter was seen talking to several Bengals players, which ultimately led to a heated cornerback Adam Jones getting an unsportsmanlike conduct penalty that set up Chris Boswell's 35-yard game-winning field goal with 14 seconds remaining.
"Assistant coaches shouldn't be on the field during an injury timeout," NFL's vice president of officiating Dean Blandino said Tuesday on NFL Network. "Medical staff, head coach can check on the welfare of a player. But we don't want assistant coaches out there. It happens, especially when there's the potential for a serious injury."
Both Porter and offensive line coach Mike Munchak, who pulled the hair of Bengals safety Reggie Nelson during a first-half confrontation on the sideline that drew a penalty, are facing potential fines.
The Pittsburgh Post-Gazette reported the Steelers have banned the media from talking to Porter this week.
Pittsburgh head coach Mike Tomlin said the Steelers do not have time to look back as they prepare for Sunday's divisional-round game in Denver against the Broncos.
"Cincinnati is afforded the opportunity to sit around days after the game and rehash what happened," Tomlin said Tuesday. "We're not afforded that opportunity. We've got a challenge -- a formidable one -- waiting on us in Denver."