J.J. McCarthy, the Vikings' first-round pick, is already endearing himself to fans by signing autographs at the team's facility. Despite the warm welcome from fans and coaches, wide receiver Justin Jefferson offered a measured perspective,

McCarthy has impressed, Brian Flores' defense looks sharp and there are roster battles aplenty as the Vikings prepare to put pads on Monday.

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?