Loper, a Texas Tech-ex, was the second player the Cowboys signed after a Tuesday workout at Valley Ranch, joining Montrae Holland. The Cowboys have 10 offensive linemen on the 53-man roster and five wide receivers.
Loper, 6-6, 320 pounds, has started nine of 58 games over six seasons with Tennessee, Detroit and Oakland. He was a fifth-round pick of the Titans in 2005.
Harris is eligible to return to the practice squad if he clears waivers but the team already has two wide receivers on the taxi squad – Teddy Williams, Andre Holmes.