A large part of NFL team building comes through the draft, but free agency remains a very important component.
The 2016 free agency period opens March 7.
Teams are then permitted to contact and enter into contract negotiations with agents of players who will become unrestricted free agents upon the expiration of their 2015 contract at 1:00 p.m. on March 9.
Let's examine the list of players who are set to become free agents in March, and who the 49ers and Raiders could possibly reach out to with the hopes of upgrading the roster.
Quarterbacks
Kirk Cousins
Ryan Fitzpatrick
Sam Bradford
Brock Osweiler
Chase Daniel
Matt Moore
Tarvaris Jackson
Chad Henne
Matt Schaub
Brandon Weeden
Jimmy Clausen
Colt McCoy
Matt Hasselbeck
Drew Stanton
Dan Orlovsky
Bruce Gradkowski
Charlie Whitehurst
T.J. Yates
Matt Cassel
Luke McCown
Scott Tolzien
Michael Vick
Matt Flynn
Kellen Clemens
Josh Freeman
Running Backs
Matt Forte
Doug Martin
Lamar Miller
Chris Ivory
James Starks
Chris Johnson
Alfred Morris
LeGarrette Blount
Ronnie Hillman
Tim Hightower
Bilal Powell
Ahmad Bradshaw
Chris Polk
Bobby Rainey
Stevan Ridley
Pierre Thomas
Lance Dunbar
Shaun Draughn
Robert Turbin
Bryce Brown
Matt Asiata
Reggie Bush
Dan Herron
DuJuan Harris
Travaris Cadet
Jordan Todman
Fred Jackson
Steven Jackson
Kendall Hunter
Jacquizz Rodgers
Bernard Pierce
Fullbacks
Mike Tolbert
John Kuhn
Darrel Young
Cory Harkey
Will Johnson
Will Tukuafu
Tyler Clutts
Wide Receivers
Alshon Jeffery
Travis Benjamin
Marvin Jones
Anquan Boldin
Rishard Matthews
Rueben Randle
James Jones
Brian Quick
Mohamed Sanu
Percy Harvin
Andre Holmes
Jermaine Kearse
Nate Washington
Leonard Hankerson
Marc Mariani
Lance Moore
Terrelle Pryor
Hakeem Nicks
Rod Streater
Jordan Norwood
Darrius Heyward-Bey
Keshawn Martin (Re-signed 2-year, $3M deal with NE)
Chris Givens
Wes Welker
Andre Caldwell
David Nelson
Bryan Walters
Seyi Ajirotutu
Jason Avant
Ricardo Lockette
Nick Toon
Brandon Gibson
Brandon Tate
Jacoby Jones
Tight Ends
Antonio Gates
Ladarius Green
Dwayne Allen
Vernon Davis
Coby Fleener
Ben Watson
Zach Miller
Marcedes Lewis
Craig Stevens
Clay Harbor
Jermaine Gresham
Andrew Quarless
James Hanna
Logan Paulsen
Daniel Fells
Garrett Celek
Tony Moeaki
Rhett Ellison
Michael Hoomanawanui
Rob Housler
David Johnson
Kellen Davis
Anthony McCoy
John Phillips
Chase Coffman
Dorin Dickerson
Offensive Tackles
Cordy Glenn
Russell Okung
Donald Penn
Kelvin Beachum
Andre Smith
Mitchell Schwartz
Joseph Barksdale
Bobby Massie
Chris Clark
Ryan Harris
Donald Stephenson
Byron Bell
Jordan Mills
Chris Hairston
Sam Young
Jake Long
Don Barclay
Byron Stingily
Jason Fox
Bradley Sowell
J'Marcus Webb
Bryce Harris
Jeff Linkenbach
Tyler Polumbus
Eric Winston
Khalif Barnes
Charles Brown
Ben Ijalana
Interior Offensive Linemen
Alex Mack
Kelechi Osemele
Alex Boone
Jeff Allen
Richie Incognito
Brandon Brooks
Ramon Foster
Evan Mathis
Ben Jones
Stefen Wisniewski
Ryan Wendell
Mike Harris
J.R. Sweezy
Chris Chester
Manuel Ramirez
Lyle Sendlein
Amini Silatolu
Will Montgomery
Lance Louis
Ted Larsen
Willie Colon
Tony Bergstrom
Josh LeRibeus
J.D. Walton
Tim Barnes
Mackenzy Bernadeau
Chris Scott
Dallas Reynolds
Mike McGlynn
Vlad Ducasse
Fernando Velasco
Shelley Smith
Brandon Mosley
Doug Legursky
Gino Gradkowski
Johnnie Troutman
Joe Looney
Jamon Meredith
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