A few deals have been signed around the NFC North in the days leading up to free agency, but plenty of valuable players are about to hit the open market.
Here is a ranking of top NFC North free agents, with information provided by ESPN.com reporters Rob Demovsky (Green Bay Packers), Ben Goessling (Minnesota Vikings), Michael Rothstein (Detroit Lions) and Michael C. Wright (Chicago Bears).
We will update this periodically throughout the next several weeks.
1.Sam Shields, Packers CB: Emerged as the Packers' top cover cornerback last season while playing for the restricted free-agent tender of $2.023 million and was re-signed to a four-year, $39 million contract just a few hours into the open negotiating period Saturday. His 2014 total pay of $15 million makes him the NFL's second-highest-paid cornerback for next season.
2. Brandon Pettigrew, Lions TE: The No. 20 pick in the 2009 draft out of Oklahoma State, Pettigrew spent the past five seasons as one of Detroit's primary tight ends, specifically known for the ability to both block and run routes effectively.
3. Jermichael Finley, Packers TE: Had surgery to fuse the C3 and C4 vertebra in his neck but expects to be cleared by his doctor. Gambled two years ago in free agency, signing just a two-year, $14 million deal in the hope that he would blossom into a star and command an even bigger contract the next time around.
4. Charles Tillman, Bears CB: The NFL's Walter Payton Man of the Year, Tillman started eight games last season before finishing on the injured reserve with a torn triceps. The Bears hope to bring back Tillman but might not be able to come up with a suitable offer.
5. B.J. Raji, Packers DT: Reportedly turned down an $8 million per year offer from the Packers last season, which might have been a sign that he preferred to play in a system that gave defensive linemen more freedom. After a disappointing season, his value has gone down, and as of last week, he was close to signing a one-year deal to return.
6. Matt Cassel, Vikings QB: Opted out of his 2014 contract after the Super Bowl but signed a new two-year deal with the Vikings on Friday, just before teams could start contacting his agent. He will likely head into training camp with the inside track on the starting job.
7. Willie Young, Lions DL: Former seventh-round pick received his first extensive playing time in 2013, becoming a full-time starter after Jason Jones was injured for the season in Week 3. Young turned into one of the more disruptive players up front, making 47 tackles, recovering two fumbles and recording three sacks.
8. James Jones, Packers WR: Ranked second on the Packers last season in receptions (59) and yards (817), the latter of which was a career high despite missing nearly three full games because of a knee injury. Three years ago, coming off the NFL lockout, Jones did not draw strong interest on the free-agent market and re-signed with the Packers for three years and $9.6 million.
9. Jared Allen, Vikings DE: After three All-Pro selections in six years, Allen’s time in Minnesota is likely over. He could come back as a situational pass-rusher on a reduced salary, but after making $14 million last season, Allen might head elsewhere for a bigger role and bigger paycheck.
10. Josh McCown, Bears QB: He proved he is capable of filling in for Jay Cutler in a pinch and is instrumental behind the scenes for nearly every skill player on the offense. It's not a slam dunk he will be back, and talks with the Bears haven't been especially productive.
11. Henry Melton, Bears DL: Melton's representatives fully expect him to test the market in free agency because the Bears haven’t shown a ton of interest. Coming off a torn ACL, Melton probably won't command top dollar in the first wave of free agency.
12. Devin Hester, Bears KR: Became strictly a return specialist for the Bears last season and is still one of the league's best at his position. Probably expects a payday similar to what he's gotten in the past.
13. Rashean Mathis, Lions CB: Mathis signed with Detroit during the 2013 preseason and became one of the team's starting cornerbacks by the third week of the season. He played in 15 games, making 47 tackles and often drawing the opponent's top wide receiver.
14. Everson Griffen, Vikings DE: The 26-year-old cashed in on Sunday by signing a five-year, $42.5 million deal that included $20 million guaranteed to return to Minnesota. He should flourish in new coach Mike Zimmer's defensive scheme.
15. Louis Delmas, Lions S: The 26-year-old was released by Detroit with one year remaining on his contract in February, in part because of a cap number of $6.5 million in 2014. Has played in 65 games for Detroit over five seasons, with 328 tackles, six interceptions and two forced fumbles. He also had five sacks and four fumble recoveries.