Baltimore Ravens cornerback Domonique Foxworth didn't play one down of football in 2010 because he suffered a season-ending knee injury one day before the start of training camp last August.
"I don't think we're going to see too many side effects of him coming back early on," Harbaugh said. "He should be full speed right out of the gates."
It typically takes a full year for a player to recover from knee surgery, which Foxworth, 27, underwent on Aug. 10.
"I don't know if he's ahead of schedule, but the good thing is -- if there is a light at the end of the tunnel or a silver lining to that cloud -- at least he got hurt as early as possible," Harbaugh said. "I mean, it was before he even really started practice, so it gives him the maximum possible time to get that knee right."