It appears that Bellator has lost one half of its main event for its return to California later this month.

Welterweight Lorenz Larkin (20-7 MMA, 2-2 BMMA) late Thursday posted on Instagram that he has had to pull out of the Bellator 219 headliner against former champion Andrey Koreshkov (21-3 MMA, 12-3 BMMA). Larkin did not give a reason for his withdrawal, and Bellator officials have not yet made a formal announcement. It is not yet known of Koreshkov will remain on the card against a replacement opponent on four weeks’ notice.

Bellator 219 takes place March 29 at Pechanga Resort Casino in Temecula, Calif. The main card will air on Paramount and stream on DAZN following prelims on MMAjunkie.

“Sorry to all the supporters but I had to pull out of the fight,” Larkin wrote on Instagram. “hopefully I will be back soon to put on another great performance for you guys @bellatormma”

Larkin was looking to continue an upward push after a rough start to his Bellator career. He has won back-to-back fights, most recently defeating Ion Pascu by unanimous decision this past October at Bellator 207. Prior to that, he outpointed Fernando Gonzalez for his first Bellator win after starting with a pair of losses, including a title bout against Douglas Lima in his promotional debut.

Koreshkov is looking to get back on track after being bounced from Bellator’s ongoing welterweight grand prix tournament this past September at Bellator 206. In the opening round, he lost by technical submission to fellow former champion Lima, the man he beat to win the title in 2015 before losing it back to him in 2016. Prior to his loss to Lima in what was a trilogy rubber match fight, Koreshkov had won back-to-back bouts.

For more on Bellator 219, visit the MMA Rumors section of the site.