Jacksonville Jaguars linebacker Russell Allen has been forced to announce his retirement at the age of just 27.
Seattle have acquired quarterback Terrelle Pryor from Oakland in exchange for a 2014 seventh-round draft pick.
The New York Jets have signed former 2,000-yard running back Chris Johnson on a two-year deal worth $8m.
The Seattle Seahawks have awarded Super Bowl-winning coach Pete Carroll a three-year contract extension.
Former Philadelphia Eagles wide receiver DeSean Jackson has agreed to join NFC East rivals Washington Redskins.
Oakland's off-season recruitment drive has continued with the signing of running back Maurice Jones-Drew.
The Miami Dolphins have completed the signing of free-agent running back Knowshon Moreno.
The New York Jets have continued their high-profile recruitment drive with the signing of Michael Vick.
The Jacksonville Jaguars signed free agent wide receiver Tandon Doss to a contract.
Denver have found a replacement for wide receiver Eric Decker after agreeing a deal with free agent Emmanuel Sanders.