A crucial welterweight bout slated for next month’s UFC 202 has taken a hit.

Dong Hyun Kim (21-3-1 MMA, 12-3 UFC) is out of his fight against Neil Magny (18-4 MMA, 11-3 UFC) on the card, a UFC official today confirmed to MMAjunkie. The promotion is seeking a replacement for Kim to keep Magny on the card.

Featuring a headlining rematch between Nate Diaz and Conor McGregor at welterweight, UFC 202 takes place Aug. 20 at T-Mobile Arena in Las Vegas. The main card will air on pay-per-view following prelims expected for FS1 and UFC Fight Pass.

Kim currently is ranked No. 10 in the latest USA TODAY Sports/MMAjunkie MMA welterweight rankings. Magny sits at No. 11.

“Stun Gun” Kim has back-to-back stoppage wins and six victories in his past seven fights. After four straight wins, including a “Knockout of the Night” victory over Silva and a “Performance of the Night” knockout of John Hathaway in March 2014, he was stopped in just 61 seconds by Tyron Woodley in Macau in August 2014.

But he has since rebounded with a submission of Josh Burkman at UFC 187 and a first-round TKO of Dominic Waters this past November in his home country of South Korea. But now his quest for three straight is put on hold.

Magny has won three straight fights and 10 of his past 11. His only loss in more than two years is a submission setback against Maia at UFC 190 in Brazil this past August.

In his current run of three straight, he has split-decision victories over Erick Silva and Kelvin Gastelum, plus a third-round TKO of Hector Lombard in March at UFC Fight Night 85. The Gastelum win took “Fight of the Night” honors in Mexico, and his win over Lombard was a “Performance of the Night” bonus winner.

The latest UFC 202 card now includes:

Nate Diaz vs. Conor McGregor

Anthony Johnson vs. Glover Teixeira

Donald Cerrone vs. Rick Story

Carlos Condit vs. Demian Maia

Neil Magny vs. TBA

Alberto Uda vs. Marvin Vettori

Tim Means vs. Sean Strickland

Cody Garbrandt vs. Takeya Mizugaki

Chris Avila vs. Artem Lobov

For more on UFC 202, check out the UFC Rumors section of the site.