"He can be ready to play on a limited number of snaps," Tomlin said. "At the end of the week when we get into some situational football things, that's going to require some physical preparation in some form or fashion. But we're going to take it day by day. We're always going to be optimistic when it comes to Ben."
Roethlisberger hasn't practiced since his injury and declined to talk to reporters Wednesday as he sported a walking boot while walking with a noticeable limp out of the team's facility. Tomlin said Tuesday that Roethlisberger was working "tirelessly" to be on the field against the 49ers, but that he would have to practice at some point this week in order to play. He will be evaluated throughout the week before a decision is made.
The Associated Press contributed to this report.