"My gut and my feeling tells me I won't need another surgery," Luck said Friday, per Zak Keefer of the Indianapolis Star.
"I feel stronger, more stable, more confident in it," he also said, per Keefer. "It's better."
Chris Mortensen of ESPN reported Dec. 17 that Luck could require another surgery in January if his pain persists.
The possible corrective surgery, called tenodesis, would require another three to six months of recovery.
Luck spent time in Europe in November to seek treatment for his surgically repaired shoulder.
The three-time Pro Bowler first underwent surgery in January for an injury that apparently dated back to the third game of the 2015 season. What followed was a messy timeline for recovery and a lot of confusion about when he would get back on the field.
Even after Luck missed the first four games of this season, he remained optimistic.
"I'll definitely play this year," he said Oct. 4, per Bob Kravitz of WTHR.com. "No question."
Though he returned to practice, he was placed on injured reserve Nov. 2 and did not play a game in 2017.
That makes it difficult to trust Luck this time around, even if he is "adamant," per Keefer, that he will participate in offseason workouts in April.
Second-year signal-caller Jacoby Brissett has filled in admirably this year, but the Colts are just 3-12, so it's clear they won't be competitive until Luck returns to full strength.