San Francisco 49ers running back Christian McCaffrey is reportedly "a long-shot" to play in his team's Week 2 game against the Minnesota Vikings, NFL Network's Ian Rapoport reported on Good Morning Football Wednesday (September 11).

McCaffrey, 28, was officially ruled out of the 49ers' Week 1 Monday Night Football game against the New York Jets shortly before kickoff. The reigning NFL Offensive Player of the Year was initially expected to play despite a calf injury that kept him out for most of training camp.

Rapoport noted that McCaffrey is also dealing with Achilles tendonitis, which is the bigger concern.

"It feels to me, just taking stock of the situation, talking to people involved, that Christian McCaffrey is a long shot to play this week against the Minnesota Vikings," Rapoport said. "Go back a couple of days to Monday night. I think we all thought, in fact, I think the 49ers all thought, that Christian McCaffrey was going to shake off a little tightness he felt late in the week of practice, be able to workout and be able to play Monday night against the Jets as he told reporters, as everyone had planned.

"He worked out pregame, it was just not quite right and we talked a lot during the course of the preseason about Christian McCaffrey's calf injury. It's more than that. It is also Achilles tendonitis, which can really be troublesome and as [49ers head coach] Kyle Shanahan noted, that's actually the injury that's giving Christian McCaffrey more trouble right now, it's the injury that is requiring more treatment than I would say the calf pull, so that is why Christian McCaffrey did not play on Monday night.

"It's a long season, he is as good as it gets. They want him healthy for this stretch run so it makes sense for the 49ers to pull back a little bit and ensure when he hits the field again he is fully healthy."