The vikings.com 2015 Free Agency Preview series uses **NFL.com’s Top 101 Free Agents* list to break down this year's class and take a look at which players may be fits for the Vikings.*

1-10: Monday
11-20: Sunday
21-30: Saturday
31-40: Today
41-50: Click here
51-60: Click here
61-70: Click here
71-80: Click here
81-90: Click here
91-101: Click here

Every level of the defense is represented in the 31-40 range of NFL.com's Top 101 Free Agents list. That's good news for the Vikings, whose defense took major strides forward last season but whose defense is also looking to take another big step forward in 2015. A Rey Maualuga-Mike Zimmer reunion was nixed earlier in the week when Cincinnati re-signed the heart and soul of their defense, but another talented veteran who mans that position is set to hit the market on Tuesday. If Zimmer wants to beef up the front line, maybe veteran Trent Cole will appeal. There are also options in the secondary with a pair of former Packers CBs and a safety from Denver who has played in a lot of big games of late.

Note: The rankings by NFL.com are subject to change because teams may release players in the coming days, causing them to hit the market.

31. CB Chris Culliver 32. S Rahim MooreAt just 25 years old and with 41 starts plus plenty of playoff experience over the past three seasons, Moore would create a lethal starting safety tandem with Harrison Smith in Minnesota. He had a career high four INTs last season, has a nose for the ball and may possess the versatility Mike Zimmer covets in his players.
33. DT Dan Williams 34. TE Jordan Cameron 35. RB Frank Gore 36. DT BJ Raji 37. LB David Harris
Durable. Productive. Smart. What else do you want from a middle linebacker? Harris has been all that and more in nine seasons with the Jets, starting all 16 games each year since 2009 and logging 100 tackles six times. He'll hit the open market on Tuesday with plenty of suitors. Will the Vikings be one of them? You couldn't blame them if they tossed their hat in the ring.

UPDATE: Harris resigned with the Jets on Friday. Bummer.

38. DE/OLB Trent ColeThere are few players with a motor that runs like Cole's. The veteran of 10 seasons has a knack for finding the QB and has tallied 85.5 career sacks, including 14.5 the past two seasons. He rarely misses games and could likely lineup on the edge in a 3-4 or with his hand on the ground in a 4-3.
39. C Stefen Wisniewski 40. CB Davon House and 41. CB Tramon WilliamsIt's unlikely that Green Bay will retain both House and Williams, so whichever one ends up searching for a new home could land across the border in Minnesota. House has been a sub package player and is looking to start, while Williams brings a lot of starting experience and some swagger.