The unranked USC Trojans will need to finish their 2018 season without senior linebacker Porter Gustin. Coach Clay Helton announced on Sunday that Gustin will require season-ending surgery on his fractured right ankle. The injury will also end Gustin's career at USC.

Gustin, who was harboring a nagging ankle injury played in Saturday night's win against Colorado. Against the Buffaloes, Gustin had six tackles including 2.5 tackles for loss and 1.5 sacks. He came out of Saturday's game in the final minutes with the same injury, according to reports.

Prior to the start of the 2018 season, Gustin underwent surgery for a meniscus tear in his left knee.

Gustin missed the majority of the 2017 season with a toe and bicep injury. Before being sidelined, he appeared in four games and had 16 tackles.

The senior exploded onto the scene in 2015 as a true freshman out of Salem Hills High School in Utah. In the 2015 season Gustin appeared in all 14 games and totaled 25 tackles. In 2016 he became a full-time starter and had 68 tackles including 5.5 sacks. He finished the year receiving both All-American and All-Pac 12 honorable mentions.

Gustin will finish his USC career with 137 total tackles including 21 sacks for 137-yards.

Helton noted that the surgery has a 3-4 month recovery time. With his collegiate career over, Gustin will likely look towards the NFL draft upon recovery.

The loss is another in a string of injuries for the Trojans. The team will head back on the road to face Utah this weekend.