The 6-foot-4, 250-pound Walford had 70 catches for 768 yards and six touchdowns in three seasons with the Raiders after being a third-round draft pick out of Miami in 2015.
He was waived by Oakland last Friday.
After catching 61 passes in his first two NFL seasons, Walford saw limited action in new coordinator Todd Downing’s offense last season. Walford missed the last three games with a concussion that landed him on injured reserve. He had just nine catches for 80 yards and no TDs.
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