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Jairus Byrd, S, Buffalo Bills
Byrd stands atop the list of free agents as the premier player available this offseason. If the Green Bay Packers want to sign him, it's going to take quite a bit of money to do so.
However, he is capable of being an instant difference-maker for a defense. Signing him would make the Packers defense feared in the league.
Donte Whitner, S, San Francisco 49ers
If the Packers don't want to break the bank for Byrd, they could look at the second-tier of safeties and still improve their secondary.
Whitner is going to bring a physical presence at the safety position that Green Bay lacked last year. Unfortunately, he doesn't have anywhere near the playmaking skills of Byrd.
Nevertheless, he'd be an improvement over the Packers' current safeties.
T.J. Ward, S, Cleveland Browns
Ward is another big-name free agent who will need to get paid in order to be signed. The only problem with him is that he plays strong safety.
That's the position that Morgan Burnett is most comfortable at, so if the Packers sign Ward, they would probably also need to look at adding a free safety. We saw what Burnett could do at free safety last year, and it wasn't pretty.
Adding Ward would be huge for Green Bay, but it would also cause a little extra work to truly improve the safety position.
Lamarr Houston, DE, Oakland Raiders
Houston hasn't been talked about much heading into free agency, but he is a big-time player. He was the 11th-best 4-3 defensive end last year, according to Pro Football Focus (subscription required).
He's likely going to be expensive to sign away from the Raiders, but it's also possible that he wants to leave Oakland. He would be most valuable for the Packers against the run.
Garrett Graham, TE, Houston Texans
Graham has never been utilized to his full potential in Houston, but he's been a productive player for the Texans. He'd also be a great fit offensively for the Packers.
In fact, Ian Rapoport of NFL.com has already said that the Packers will pursue him if the Texans don't re-sign him. By signing Graham, the Packers would be able to let both Andrew Quarless and Jermichael Finley leave via free agency.
Brandon Spikes, ILB, New England Patriots
There's no doubt that Spikes would be a great addition for the Packers due to his ability to stop the run at an elite level. However, that's the only thing that he does well as an inside linebacker.
While the Packers don't necessarily need another one-trick pony on defense, he is so good against the run that they could still be interested.
Linval Joseph, DT, New York Giants
Joseph is another player who isn't quite getting enough attention as he should be heading into free agency. He graded out as the No. 21 overall defensive tackle in the NFL last year, per Pro Football Focus (subscription required).
What makes him such a great fit for the Packers is that he's already an established run-stopper, but he also has the ability to create pressure on quarterbacks when he needs to. He'd be the ideal fit at defensive tackle for the Packers 3-4 defense.
Randy Starks, DT, Miami Dolphins
Starks is coming off a solid season for the Dolphins and should have plenty of suitors in free agency. Unfortunately, he is also already 30 years old.
If the Packers are looking to draft a young defensive tackle in May, they could sign Starks to a deal for only a few years while they develop their draft pick.