Johnson has been dealing with a variety of injuries, most notably his knee. He missed practice on Wednesday and Thursday, but was limited in practice on Friday. Johnson missed practice all of last week and caught 120 yards worth of passes against the Jaguars, so he should be fine to play on Sunday.
Fantasy Impact: Calvin Johnson is safe to start despite his injury. He has struggled a bit this season, but came on strong with 120 yards last week.
The Vikings present Johnson with another easy matchup, so he's definitely worth starting. Who knows, maybe he'll even find the endzone this week.