INDIANAPOLIS (AP) " Andrew Luck was eager to get back to work Monday but he's still not sure when he'll be start throwing passes.

Three months after undergoing shoulder surgery, the Indianapolis Colts quarterback showed up for opening day of offseason workouts looking fit, trim and minus the sling he'd been wearing to protect his right arm.

"I am where the physical therapists, trainers and doctors say I am. I'm not going to worry about it," Luck said, declining to provide a timetable for his expected return. "I have full trust in the guys helping me out."

Team officials have already said they don't expect Luck to participate in much " if any " on-field drills between now and the end of June's three-day mini-camp.

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The hope is Luck will be healthy enough to return to action for the start of training camp. And there's little doubt the Colts will be patient after watching their franchise player endure two straight injury-plagued seasons.

Luck acknowledged Monday for the first time that his physical woes began at Tennessee in Week 3 of the 2015 season. Luck led the Colts to a come-from-behind win that day to avoid a 0-3 start, but the most indelible image from the game was the sideline video of then backup quarterback Matt Hasselbeck tapping Luck on the chest. Luck winced in pain.

Over the next four weeks, Luck downplayed the injury, though he had the first two missed games of his career.

He wound up missing nine games that season, the last seven with a lacerated kidney, before opting for rehab over surgery.

Last year, the Colts thought they could keep Luck on the field with extra time off during the week. At times it helped, but the pain eventually returned and the continued ailments prompted Luck to choose surgery after last season.

"It was my decision, ultimately," Luck said. "The team gave me all the resources I felt like I needed to make the best decision, and I have no regrets about having surgery."