The Vikings are entering an offseason in which significant changes are expected in some areas and fine tuning is needed in others. Pro football writer Matt Vensel takes a position-by-position look at the team.

Vikings offseason primer: the defensive line

The defensive line in 2015 was again an area of strength for the Vikings, especially so before nose tackle Linval Joseph suffered a toe injury in late November.

Vikings offseason primer: the linebackers

For the second straight year, the Vikings in 2015 used a high draft pick on a linebacker from UCLA. Eric Kendricks led the team in tackles and showed promise.

Vikings offseason primer: running backs

After a long hiatus from the Vikings and the NFL, Adrian Peterson returned in 2015 to re-establish himself. But there are concerns about him. Second in a series of reports.

Vikings offseason primer: wide receivers and tight ends

The passing attack didn't quite pan out as the Vikings expected in 2015. Third in a series looking at the Vikings as they enter the offseason.

Vikings offseason primer: the offensive line

Two days after the season-ending loss to the Seahawks, coach Mike Zimmer made it clear that changes would be coming to the subpar Vikings offensive line.

Vikings offseason primer: the defensive backs

Andrew Sendejo and Robert Blanton are free agents, and the Vikings could choose to let them walk. Josh Robinson is also likely a goner