LAS VEGAS – A training injury has forced Tarec Saffiedine (15-3 MMA, 1-0 UFC) to bow out of next month’s UFC 172 event in Baltimore. With his intended opponent scrapped, Jake Ellenberger (29-7 MMA, 8-3 UFC) will now shift to May’s UFC 173 fight card, where he’ll meet fellow welterweight Robbie Lawler (22-10 MMA, 7-4 UFC).

MMAjunkie and USA TODAY Sports today confirmed the changes with UFC President Dana White.

Headlined by bantamweight title fight between champion Renan Barao and challenger T.J. Dillashaw, UFC 173 takes place May 24 at Las Vegas’ MGM Grand Garden Arena. The Ellenberger vs. Lawler matchup airs on the evening’s five-fight pay-per-view main card (10 p.m. ET) and follows preliminary-card bouts on FOX Sports 1 and UFC Fight Pass.

It’s the second time a planned Ellenberger vs. Saffiedine bout has been nixed. The two were expected to meet at a January event in Singapore, but Ellenberger suffered a hamstring injury in training and was replaced by Hyun Gyu Lim.

The hard-hitting Ellenberger returns to the cage for the first time since a lackluster July loss to perennial contender Rory MacDonald. Still, the 29-year-old Nebraskan – who currently lives and trains in Lake Forest, Calif. – is 8-2 in his past 10 outings and is currently ranked No. 4 in the latest USA TODAY Sports/MMAjunkie MMA welterweight rankings.

Meanwhile, Lawler, who’s ranked No. 10, looks to rebound from a failed bid at the UFC’s welterweight title after. Earlier this month, he dropped a thrilling five-round decision to now-champ Johny Hendricks in a “Fight of the Year” candidate. An Iowan who now trains with Florida’s American Top Team, the 32-year-old Lawler boasts nearly 13 years of professional experience.

A timetable for Saffiedine’s return to action wasn’t immediately established, but he’s expected to know more after a doctor’s visit next week. The nature of the injury wasn’t immediately revealed.

The latest UFC 173 card now includes:

Champ Renan Barao vs. T.J. Dillashaw – for UFC bantamweight title

Junior dos Santos vs. Stipe Miocic

Jake Ellenberger vs. Robbie Lawler

Takeya Mizugaki vs. Francisco Rivera

Tony Ferguson vs. Katsunori Kikuno

James Krause vs. Jamie Varner

Chris Holdsworth vs. Kyung Ho Kang

Mitch Clarke vs. Al Iaquinta

Michael Chiesa vs. Francisco Trinaldo

Anthony Njokuani vs. Vinc Pichel

Yves Edwards vs. Piotr Hallmann

Doo Ho Choi vs. Sam Sicilia

Jingliang Li vs. Danny Mitchell

For the latest on UFC 172 and UFC 173, stay tuned to the UFC Rumors section of the site.

(Pictured: Robbie Lawler)