Vikings RB Jerick McKinnon (ankle) practiced fully Wednesday, Ben Goessling of ESPN.com reports.
The 49ers' front seven was stout in Monday's contest, containing Adrian Peterson to 31 yards on his 10 carries. Spelling the veteran in the second quarter, McKinnon turned three carries into 20 yards and two catches (on as many targets) into eight yards.
Overall, Peterson picked up 36 of the Vikings' 64 offensive snaps, versus eight for McKinnon, so the latter likely doesn't have enough utility to act as much more than a handcuff to Peterson.