49ers’ McCaffrey mentally preparing to play in Week 2 vs. Vikings

SANTA CLARA — Running back Christian McCaffrey peeled back the curtain on Wednesday to share his mental approach while he's going through some physical issues. A week ago, McCaffrey said there was no doubt in his mind he would play in the Week 1 game against the New York Jets. He was deactivated 90 minutes before kickoff due to Achilles tendinitis and a calf strain. This week, he is not changing his approach. "My mentality is I'm playing this week," McCaffrey said on Wednesday. "That's where I'm at. That's how I am every week. I'm not lying. As soon as a player says, 'Maybe I'll play, maybe I won't,' that's not a good mentality to go into a week with when you're kind of on the fence. For me, I'm ready to go." McCaffrey was expected to be a limited participant in practice on Wednesday, as the 49ers begin preparations to face the Minnesota Vikings on the artificial turf of U.S. Bank Stadium. The surface of the field will have no impact on McCaffrey's availability, he said. "If you can't run on turf, you can't run on grass," he said. "If you can go, you can go." McCaffrey said the lower-leg issues he is dealing with now is not a carryover from the issue he experienced late last...