One of the summer’s most anticipated scraps has been laid to waste, as UFC lightweight-turned-featherweight Anthony Pettis was forced to withdraw from his August 3 tilt with champion Jose Aldo at UFC 163 after suffering a knee injury while training. As a result of his removal, Chan Sung Jung has gotten the nod to step in as a replacement.

UFC President Dana White confirmed the disappointing news earlier today on Twitter. No details were provided on the severity of Pettis’ affliction. A replacement for Jung will be found for his previously scheduled showdown with Ricardo Lamas at UFC 162.

The 13-3 Jung is on a three-fight winning streak including wins over Mark Hominick and Dustin Poirier. Eleven of his victories have featured some form of finish.

Aldo holds an overall record of 22-1 and is 12-0 since signing with Zuffa. Among his notable victims are the likes of Urijah Faber, Cub Swanson, and Frankie Edgar.

UPDATE: Pettis commented on the situation via Twitter, writing, “Injuries are part of the sport. Small tear in my meniscus. I was so ready for this fight, this won’t stop me! Be back soon.”