The team announced the move Monday, along with the signing of wide receiver John Harris.
The 6-foot, 224-pound Spruill was drafted 168th overall out of Syracuse. But he missed his entire rookie season after undergoing reconstructive knee surgery.
Harris was initially signed by Philadelphia as a college free agent from Texas. The 6-2, 215-pounder had a breakout senior season for the Longhorns, catching 68 passes for 1,051 yards and seven touchdowns in 2014.