Undefeated women’s bantamweight contender Ketlen Vieira (10-0 MMA, 4-0 UFC) has been forced to withdraw from a planned appearance at next month’s UFC Fight Night 137 event.

The promotion is now seeking a replacement opponent for Tonya Evinger (19-6 MMA, 0-1 UFC), MMAjunkie today learned from a person with knowledge of the search who requested anonymity because promotion officials haven’t formally revealed the withdrawal.

The person also indicated the promotion is hoping for a Brazilian replacement due to the difficulty of securing travel visas on short notice but is open to all options.

Featuring a headlining bout of Jimi Manuwa vs. Thiago “Marreta” santos, UFC Fight Night 137 takes place Sept. 22 at Ibirapuera Gymnasium in Sao Paulo.

Evinger, a women’s MMA pioneer and former Invicta FC bantamweight champion looks to fight for the first time since her UFC debut, a July 2017 loss to Cris Cyborg in a failed bid for the UFC women’s featherweight title. Evinger hoped to return earlier this year, but a knee injury forced her to the sidelines until now.

Meanwhile, a timetable wasn’t immediately available for Vieira’s return.

With Vieira’s withdrawal, UFC Fight Night 137 now includes:

• Jimi Manuwa vs. Thiago “Marreta” Santos
• Tonya Evinger vs. opponent TBA
• Sam Alvey vs. Antonio Rogerio Nogueira
• Neil Magny vs. Alex Oliveira
• Antonio Carlos Junior vs. Elias Theodorou
• Evan Dunham vs. Francisco Trinaldo
• Luis Henrique vs. Ryan Spann
• Renan Barao vs. Andre Ewell
• Sergio Moraes vs. Ben Saunders
• Thales Leites vs. Hector Lombard
• Belal Muhammad vs. Elizeu Zaleski dos Santos
• Alex Chambers vs. Livia Renata Souza

For more on UFC Fight Night 137, check out the UFC Rumors section of the site.