Vikings beat writer Ben Goessling:
The Vikings have completed 13 passes to rookie receiver Stefon Diggs, who’s posted 216 yards in his first two games of NFL action, but with Charles Johnson looking likely to return this week from a rib injury, Diggs might not see the same number of opportunities on Sunday in Detroit he’s enjoyed the past two weeks. Offensive coordinator Norv Turner said Thursday “we’re comfortable with all six of our receivers,” and told reporters to slow down on praising the rookie. Johnson appeared to be working ahead of Diggs in the Vikings’ three-receiver set during practice this week. Considering the Vikings haven’t put four receivers on the field at the same time this season, Diggs’ targets might not be as frequent Sunday.
This somewhat conflicts with an earlier report that Diggs was getting first team reps, but if he's rotating in behind Johnson then both reports could be technically true. Owners using Diggs this week should be aware that he may see a reduction in playing time, however illogical it may be.