[4] Two days after his Giants release, Underwood was a member of the New York Jets' practice squad.
[4] In December, he was signed by the Buffalo Bills and added to their practice squad for the remainder of the season.
After his release from the Gladiators, Underwood signed with the Cincinnati Commandos of the Continental Indoor Football League.
The Commandos went 9–1 in the regular season, and Underwood went on to win 1st Team All-CIFL honors as a defensive back.
[7] Underwood re-signed with the Commandos for the 2012 season, as the team transferred into the United Indoor Football League.