The UFC is hoping to find a replacement for Gamburyan, but no one has been signed just yet.
Gamburyan (11-5) hasn't competed since losing a WEC featherweight title fight to Jose Aldo in September. This fight would have marked his first in the UFC since January 2009.
Assuncao (15-3) won a unanimous decision over LC Davis in November. He has yet to compete in the UFC.
UFC 128, headlined by Mauricio "Shogun" Rua vs. Jon Jones, airs live on pay-per-view on March 19. The Gamburyan-Assuncao bout was scheduled for the non-televised portion of the card.
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