Lumpkin heads to the practice squad after seeing action in last Sunday's 38-10 victory over Detroit. In the game he recorded one tackle for the Cardinals, who notched their first win since September with the victory against Detroit. Lumpkin had spent the previous two seasons on Arizona's practice squad, after signing as an undrafted free agent out of Kentucky.
Meanwhile, Whittaker was also signed Tuesday to try and add depth to the running back position. The 5'10, 202-pound rookie went unsigned out of Texas last April after his senior season was cut short by injury. However, when Whittaker was on the field in Austin he was dynamic. He finished his career with 1,238 yards and 12 touchdowns.
To make room on the roster for the two, Arizona was forced to cut second-year tight end Steve Skelton.
Skelton is the brother of Cardinals back-up quarterback John Skelton.