The bantamweight bout was originally expected to take place on Oct. 16, but news broke this past week that the match had been postponed after Tate tested positive for COVID-19.
A former UFC and Strikeforce bantamweight champion, Tate (19-7) recently returned from retirement to stop Marion Reneau with ground and pound. That win marked “Cupcake’s” first since choking out then-champion Holly Holm at UFC 200 in March 2016.
Vieira (11-2), ranked No. 8 in the MMA Fighting Global Rankings, three spots over Tate, is coming off a decision defeat to Yana Kunitskaya in February, just five months after a win over Sijara Eubanks. The Nova União fighter is 5-2 under the UFC banner with key victories over Cat Zingano and Sara McMann.