According to Harbaugh, Lattimore is “working through something” right now, per Matt Barrows.
After talking to Lattimore on Monday, Barrows offers an “educated guess” that he is dealing with soreness in his leg as he works his way back from a over a year away from football.
The good news is that Harbaugh did say that the issue isn’t related to his knees.
Lattimore, 22, sat out his rookie year while rehabilitating a major knee injury that he sustained in college, which included a torn MCL, PCL and a dislocated kneecap.
San Francisco had said a few months ago that they expected to have Lattimore back for their offseason program, but it makes sense to give him the time he needs to get closer to 100 percent.
The 49ers drafted RB Carlos Hyde, who was considered to be the No. 1 running back in this year’s draft by a number of analysts, so it’s not as though they are counting on Lattimore to be a major contributor in 2014.