Former Strikeforce welterweight champion Tarec Saffiedine has been forced out of UFC 172 due to injury.

His scheduled opponent, Jake Ellenberger, will now face recent title challenger Robbie Lawler at UFC 173 in May.

Saffiedine picked up his first Octagon win in January, edging Hyun Gyu Lim via decision. The Belgian fighter was looking to extend his current winning streak to six against Ellenberger at the April 26 event in Baltimore. It’s the second time that a fight between the two has been scrapped. Ellenberger was Saffiedine’s original opponent for the January event, but was forced out with an injury.

For Ellenberger,  the fight will be an opportunity to get back into title contention. After dropping his UFC debut in late 2009, the Nebraskan reeled off six straight wins, but is just 2-2 in his last four appearances in the Octagon. The 29-year-old has been out of action since July, where he suffered a unanimous decision loss to Rory MacDonald.

Lawler, meanwhile, will look to quickly rebound from a hard-fought unanimous decision loss to champion Johny Hendricks at UFC 171 on March 15. The loss snapped the 32-year-old’s three-fight winning streak inside the Octagon. The Strikeforce and EliteXC veteran has gone through a career resurgence since returning to the UFC and dropping down to welterweight.

UFC 173 takes place Saturday, May 24 from the MGM Grand Garden Arena in Las Vegas. It will be headlined by a bantamweight title fight between current champion Renan Barao and challenger T.J. Dillashaw. The night’s main card will air live on pay-per-view.