Running back Matt Lawrence said he has not ruled out returning to the field this season.
Lawrence, who remains on the team's physically-unable-to-perform list since suffering a knee injury that forced him to injured reserve on Nov. 24, conceded that he is anxious to play football again.
"Just by doing all of the stuff that they're asking me to do, I'm in a great program, and when I get right, I'll be right," he said. "As of right now, we're just going to keep doing what we've been doing and keep progressing."
Harbaugh said he had no update to provide, adding, "We're thinking about it right now - whether we want to do something right now or wait until next week. But we'll be looking at him real soon just to see how he holds up in a practice-type of setting. But it could be as early as Wednesday [or] it might be as late as next week."