Which free-agent signing will have the biggest impact in the NFC North? ESPN's NFC North reporters make their picks:

Rob Demovsky, Packers reporter: Mike Glennon. And that doesn't mean it will be a positive impact. The Chicago Bears moved on from the talented, but mercurial Jay Cutler and put their struggling franchise in the hands of a quarterback who sat on the bench in Tampa Bay the last two years. A better option for the Bears would have been Jimmy Garoppolo or Tony Romo. But when the Patriots decided to hang on to Tom Brady's backup and the Cowboys stalled in making a move with Romo, it left the Bears without a great quarterback option. The impact comes in the sense that the Bears could again be a gimme for wins for the rest of the division.

Jeff Dickerson, Bears reporter: Splurging for right tackle Rick Wagner was a brilliant move by Detroit. Of course, Wagner was expensive -- a five-year contract worth $29.5 million guaranteed -- but he's a major upgrade up front for a team that also added right guard T.J. Lang. Wagner not only helps protect franchise quarterback Matthew Stafford, he should open holes in the run game. Run blocking matters, and the Lions' offense has been way too one-dimensional. In Wagner, Detroit gets a dominant right tackle it can run behind. To some, signing offensive linemen in free agency is boring, but I can't think of a bigger pickup inside the division.

Ben Goessling, Vikings reporter: Viewed purely in terms of what he is replacing, it might be Riley Reiff in Minnesota. The Vikings gave Reiff a five-year, $58.5 million deal that included $26.3 million in guaranteed money, and it shouldn't be assumed he's going to be a stalwart left tackle. But even if he's average, he might be enough of an upgrade to make a significant difference for the Vikings in the division. Their offensive line was positively dreadful a year ago, with T.J. Clemmings' first stint at left tackle going so poorly that it led the Vikings to sign the oft-injured Jake Long. Clemmings wound back up at left tackle after Long was lost to a torn Achilles, and the Vikings badly needed a solution on the left side. A team that started the season 5-0 lost eight of its final 11 games in large part because of crippling injuries and rank ineffectiveness on the line. If Reiff and Mike Remmers are able to provide competence at the tackle positions, the Vikings' offense might be competent enough to help the team return to the playoffs.

Michael Rothstein, Lions reporter: Of the four teams in the NFC North, only one will definitely have a new quarterback under center for the start of the 2017 season. That, of course, is the Bears and Glennon. Because Glennon will be charged with running an entire offense -- and doing so without Alshon Jeffery -- he immediately becomes the biggest impact signing in the division. Yes, the Lions improved their offensive line with Wagner and Lang, the Packers added a dynamic tight end in Martellus Bennett and Minnesota made its defense stronger with Datone Jones, but Glennon is the one who will have the ball every offensive snap. If the Bears are going to make a push from their spot at the bottom of the division, it will come from consistent play out of the 27-year-old Glennon, who is 5-13 as a starting quarterback, all with Tampa Bay.