Minnesota Vikings star receiver Justin Jefferson has spent a significant amount of time this offseason with quarterback J.J. McCarthy, aiming to build chemistry both on and off the field.

Here are five storylines to follow as the Vikings open training camp this week at TCO Performance Center. There were flashes of brilliance from McCarthy in the spring; he impressed on the field with his arm talent, and off the field with his magnetic personality at the podium. Will he be able to keep the momentum going in the summer?