Carlos Hyde, expected to become the San Francisco 49ers' lead running back in the wake of franchise rushing leader Frank Gore's free-agent departure, will begin training camp on the active/non-football injury (NFI) list.
Hyde is one of four players placed on the list Tuesday by the Niners.
In OTAs, Niners rookie coach Jim Tomsula explained Hyde's absence as "nothing serious" at the time, though it was believed to be a calf issue.
"Carlos is -- look, we're not in a hurry with him right now," Tomsula said on May 29. "It's nothing serious, but let's be at 100 percent when we get to training camp. He's in all the meetings and he's here and he's working out and he's doing his stuff. It's just more on the cautious side of just making sure we've got everything healed, and then we move forward.
"It's not even a hamstring; it's a muscle pull. You talk to our medical people -- (at a) different time of the year, Carlos would be pushing through. But why? That's my whole point on everything. Why do that now and take any kind of chances on things? Let's just get it healed and get going."
It doesn't sound like it's anything to worry about at this point and the team is just being cautious. The 49ers signed veteran running back Reggie Bush as a free agent, drafted Mike Davis out of South Carolina in the fifth round, and welcomed back Kendall Hunter from a torn ACL that cost him last season. The team opens training camp with its first practice Saturday.