Chan-Sung's manager Brian Rhee confirmed the surgeries to MMAFighting.com.
"Most likely, he'll be out a year," Rhee said, "but that depends on how rehab goes."
Aldo defeated Chan-Sung via fourth-round TKO moments after the Korean dislocated his shoulder. Following the fight, Chan-Sung said he didn't think surgery would be necessary for his injured shoulder.
The fight was Chan-Sung's first since May 2012 due to left shoulder surgery, and it now appears the 26-year-old will be sidelined for an extended period of time again.