With a little more than six weeks to go, UFC Fight Night 127 finally has a main event.

UFC officials today announced that former UFC heavyweight champion Fabricio Werdum (23-7-1 MMA, 11-4 UFC) will face former Bellator champ Alexander Volkov (29-6 MMA, 3-0 UFC) in the headliner of the March 17 event, which takes place at The O2 in London and streams live on UFC Fight Pass.

Werdum currently sits at No. 4 in the latest USA TODAY Sports/MMAjunkie MMA heavyweight rankings, while Volkov checks in at No. 13

Werdum said in Boston 12 days ago at UFC 220 he should be next in line for a heavyweight title shot. But instead, light heavyweight champion Daniel Cormier will move up to challenge champ Stipe Miocic in a superfight at UFC 227 in July after the two coach the upcoming season of “The Ultimate Fighter” opposite each other.

Werdum lost his title to Miocic at UFC 198 in May 2016. He bounced back with a win over Travis Browne, then lost a majority decision to Alistair Overeem at UFC 213 this past July. He returned and submitted short-notice opponent Walt Harris at UFC 216, then headlined UFC Fight Night 121 in Sydney in November and took a decision from Marcin Tybura.

Werdum, from Brazil, has fought in England four times in his career, including twice in the UFC. He lost to Arlovski in his promotional debut at UFC 70 in April 2007 in Manchester. But he stopped Brandon Vera with a first-round TKO at UFC 85 in London.

Meanwhile, Volkov looks to remain perfect in the UFC after kicking off his octagon run with wins over Timothy Johnson at UFC Fight Night 99, Roy Nelson at UFC on FOX 24 and, most recently, Stefan Struve at this past September’s UFC Fight Night 115. The Russian native boasts a five-fight winning streak, overall, a run that includes a pair of victories under the M-1 Challenge banner.

With the addition to the card, UFC Fight Night 127 now includes:

Fabricio Werdum vs. Alexander Volkov Jan Blachowicz vs. Jimi Manuwa Leon Edwards vs. Peter Sobotta Mark Godbeer vs. Dmitry Poberezhets Magomed Ankalaev vs. Paul Craig Nasrat Haqparast vs. Alex Reyes Kajan Johnson vs. Rustam Khabilov Charles Byrd vs. John Phillips Elizeu Zaleski dos Santos vs. Jack Marshman Oliver Enkamp vs. Danny Roberts Hakeem Dawodu vs. Danny Henry

For more on UFC Fight Night 127, check out the UFC Rumors section of the site.