Steelers' Hines Ward suffers concussion
Ward "will go through his normal battery of tests after sustaining a concussion," Tomlin said. "We'll see where we are in terms of next week."
After Ward stumbled while being helped off the field, the Patriots challenged the completion and it was overturned because Ward did not maintain possession as he struck the ground.
Ward spent the second quarter standing on the sideline, helmet off, before going to the locker room shortly before halftime.
Ward's injury was initially described as a neck injury by the Steelers. The wideout said after the game that he wanted to return, but team doctors would not allow him to re-enter the game.
Ward did not catch a pass, ending his Steelers-record streak of making at least one reception in 186 consecutive games.
James Walker covers the AFC North for ESPN.com. Information from The Associated Press contributed to this report.