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Perhaps the most bandied-about rumor involving free agency and the Vikings involves a productive performer from across the border, Greg Jennings (formerly) of the Green Bay Packers.
Minnesota followers well know the damage Jennings can cause. In 14 games against the Vikings, Jennings put up 964 yards on 65 receptions for 10 touchdowns—a good season nearly in itself.
Greg Jennings has indicated he's willing to play for the Vikings, although he didn't provide a ringing endorsement either, quickly adding that he would play for any team in the National Football League willing to have him. Jennings' interest is probably not the biggest barrier to his inclusion on the Minnesota roster.
Jennings could provide veteran leadership in the locker room, a deep understanding of the Packers offense and the ability to move defenders out of box—all things the Vikings need.
But his age (he will be 30 for most of the 2013 season) and recent injury history give reason for pause. The Vikings had the fifth youngest team in the NFL and the second youngest team in the playoffs (and started the year at fourth and first, respectively), and will want to continue the trend toward younger players as they build for the future. Twenty-two of the 53 players on the roster by the end of the year were in their first or second seasons.
Over the past two years, Greg Jennings has missed more regular season games (11) than the "injury-prone" Percy Harvin has in his career (10). The variety of injuries should be cause for concern as well, given that abdominal strains, hamstring injuries and a sprained medial collateral ligament have sidelined him in recent years and concerns about durability could stay Spielman's hand for an already inconsistent receiving corps.
He also does not provide the additional dynamic the Vikings need. According to Pro Football Focus (in their subscription-only Premium Stats section), Jennings has had over a third of his touchdowns, receptions and yards come from the slot position in the last five years and produced more yards there than going deep—unusual for what many people consider a multi-talented receiver.
While the Vikings haven't locked up Percy Harvin to a long-term deal, they likely won't need help at the slot.
Jennings has an unusually low catch rate for deep balls and doesn't take the top off of defenses as well as one might think—playing with Randall Cobb, Jordy Nelson, James Jones and Donald Driver made Jennings less important for opposing defenses, and he still only managed 45 yards a game.
He's undoubtedly a skilled player, deservedly called by some the best free-agent receiver available (subscription), but without the ability to either play at all three levels or consistently move safeties back, his value to the Vikings would be less than the contract he would rightly command.
Of course, if the Vikings move Harvin, that could change.