Peterson has been dealing with an ankle injury and an illness. He missed practice on Thursday due to the illness, but practiced in full on Wednesday and Friday despite his bum ankle.
Fantasy Impact: Adiran Peterson is one of the best running backs in fantasy football, and he has to be started in all formats. His illness was minor and he is pretty much over his ankle injury, so there's no need to worry about his health.
The Vikings have a decent matchup against the Lions, although they have actually been decent against the run. That being said, Peterson is matchup proof, so keep him in your lineup.