Brown was originally slated to face Brazilian-American submission ace Vagner Rocha (7-2) in a featherweight match-up. Promotion officials are actively searching for a replacement opponent.
A former WEC champion, Brown hoped to return to title contention after erasing a two-fight slump with a tough win over Nam Phan at UFC 133. Prior to entering the UFC, the 36-year-old rotated wins and losses in his final four WEC appearances, earning first round victories over Cole Province and Anthony Morrison between setbacks to Manny Gamburyan and current UFC champion Jose Aldo.
UFC on FX 1 fight card:
Lightweight: Jim Miller vs. Melvin Guillard
Welterweight: Josh Neer vs. Duane Ludwig
Heavyweight: Pat Barry vs. Christian Morecraft
Lightweight: Fabricio Camoes vs. Reza Madadi
Featherweight: Vagner Rocha vs. TBA
Middleweight: Jorge Rivera vs. Eric Schafer
Light Heavyweight: Ryan Jimmo vs. Karlos Vemola
Welterweight: Charlie Brenneman vs. Daniel Roberts
Bantamweight: Joseph Sandoval vs. Nick Denis