Five new wide receivers — including first-rounder Justin Jefferson — learning the Vikings' system

Adam Thielen, being a proven commodity at wide receiver, probably didn’t have to flex his muscles for coach Mike Zimmer during team warmups Monday.Many members of the Vikings offense enjoy knowing Gary Kubiak's playbook, a much-needed element of familiarity in an oddly truncated NFL offseason. One position, however, is largely an exception.

Of the Vikings' 10 receivers, five are newcomers to the team — and only five have ever caught an NFL pass. Behind veteran Adam Thielen, the green targets have started to separate themselves, especially in padded practices that began Monday.

The main addition to the rebuilt receiving corps — first-round draft pick Justin Jefferson — already has turned heads.

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