49ers elevate Russell Gage, Curtis Robinson from practice squad to face Seahawks

SANTA CLARA — Christian McCaffrey felt something and did not even attempt to push through the discomfort.The 49ers’ star running back removed himself from practice on Thursday with what San Francisco identified as a calf injury.McCaffrey did not practice on Friday. He was seen working with a member of the 49ers’ athletic training staff as his teammates took the field to continue preparing for their Week 1 game on Sunday.The 49ers listed McCaffrey as questionable on the official injury report. San Francisco opens the regular season on the road Sunday against the Seattle Seahawks.McCaffrey said he feels “great,” adding, “I always expect to play.”And with a long season ahead, McCaffrey said he is not thinking about saving himself for any point in the future. He made it clear that he wants to be on the field against the Seahawks.“Look, at the end of the day, if you can play, you play,” McCaffrey said. “It’s as simple as that.”McCaffrey indicated that his decision to cut his practice session short on Thursday was a matter of learning from his past mistakes.“I felt like it was the smart thing to do to not...