Here are the openings in a 'two-tier' Vikings roster

Even the Vikings — a front office rarely dipping its toes into a risky proposition — needed to pinch pennies.

That’ll happen when the bills come due on a quarterback (Kirk Cousins: $84 million guaranteed) and key defenders (Eric Kendricks: $11.6 million at signing; Danielle Hunter: $40 million in at-signing and injury guarantees) in the middle of a Super Bowl push. Representatives for receiver Stefon Diggs and linebacker Anthony Barr heard last month from the Vikings, who have cap room with $14.061 million in 2018 space before signing top pick Mike Hughes, about their possible extensions.

After all that spending, which included an $8 million free-agency charge for defensive tackle Sheldon…