Brok Weaver won’t be making his UFC debut this weekend.

Weaver (14-4 MMA, 0-0 UFC), who earned a UFC deal with a memorable performance in the cage and on the mic during this past season of Dana White’s Contender Series, has been forced to withdraw from this weekend’s UFC on ESPN+ 19 event, MMA Junkie today confirmed with UFC officials.

A replacement is currently being sought to face Weaver’s intended opponent, fellow lightweight Thomas Gifford. Due to the difficulty of arranging a work visa on such short notice, prospective candidates will most likely need to be based in the U.S.

Gifford (17-8 MMA, 0-1 UFC) made his UFC debut earlier this year, dropping a unanimous decision to Roosevelt Roberts in April at UFC on ESPN+ 8. The loss snapped a five-fight winning streak for “The Young Lion.”

A timetable for Weaver’s return wasn’t immediately clear.

UFC on ESPN+ 19 takes place Saturday at Amalie Arena in Tampa, Fla. The entire card streams live on ESPN+.

The latest UFC on ESPN+ 19 lineup includes:

MAIN CARD (ESPN+, 8 p.m. ET)

Joanna Jedrzejczyk vs. Michelle Waterson

Kron Gracie vs. Cub Swanson

Thomas Gifford vs. opponent TBA

Mackenzie Dern vs. Amanda Ribas

Matt Frevola vs. Luis Pena

Eryk Anders vs. Gerald Meerschaert

PRELIMINARY CARD (ESPN+, 5 p.m. ET)

Niko Price vs. James Vick

Devin Clark vs. Ryan Spann

Max Griffin vs. Alex Morono

Tim Elliott vs. Deiveson Figueiredo

Hector Aldana vs. Miguel Baeza

Andrew Sanchez vs. Marvin Vettori

J.J. Aldrich vs. Lauren Mueller

Andre Ewell vs. Marlon Vera