The Minnesota Vikings will kick off their preseason against the Houston Texans on Saturday. All eyes will be on J.J. McCarthy, who missed his entire rookie season after tearing his right knee meniscus in last year's preseason opener.

With J.J. McCarthy taking over as the starting quarterback, the role of superstar wide receiver Justin Jefferson has become even more important. Unfortunately, Jefferson has been dealing with an injury during training camp.

Justin Jefferson's availability continues to be a major concern in the Minnesota Vikings camp as the team gears up for its preseason opener. Days into training camp, the superstar wide receiver complained about discomfort in his left hamstring.