Ron Schwane/Associated Press
The Las Vegas Raiders addressed a few areas of need during the NFL's legal tampering window, but as the official start of free agency approaches, they have not done much to improve their offense.
The only non-quarterback the Raiders have reportedly signed is tight end Jason Witten, who agreed to a one-year contract, per ESPN.com's Todd Archer.
Las Vegas could be in the market to improve its wide receiver corps, as ESPN's Josina Anderson reported it was one of five sides with interest in wide receiver Phillip Dorsett.