Andrew Luck is still not throwing, but he remains unconcerned.

The quarterback is still recovering from shoulder surgery.

"Feeling better and better every week," Luck said. "Still haven't started throwing. But that process will come when it's ready."

When asked about the status of his rehab, he replied: "No reason to be sullen or morose! It's a beautiful day."

Andrew Luck, who has been out since January following right shoulder surgery, isn't sure he'll be ready for the start of training camp in late July.

"To be honest, I have not thought about it," Luck said. "If I'm ready for it, then great. If I'm not, then that's the way it is. I'm certainly hopeful for it. In my mind all I can do -- and I truly feel this way -- with this rehab, with my shoulder, I can't look five months down the road, three months down the road, a week down the road. To me it's about the next rehab session, the next day. That's where my focus is and that's where I think it needs to be to truly get back to 100 percent."

The Colts have shied away from giving a timetable on Luck's return.

Andrew Luck's surgically-repaired right shoulder is "healing tremendously," according to Indianapolis Colts owner Jim Irsay.

The quarterback had surgery five months ago.

"This [surgery] has been a positive thing, not a negative thing or anything like that," Irsay told season-ticket holders. "He was really struggling going through the process of being ready to play [each week last season]. This was, quite frankly, not that complicated of a surgery. This was a simple labrum repair. There are a lot of other things that could have been involved with this surgery that weren't."

Irsay didn't provide a timetable for when Luck will begin throwing a football, but he has said in the past that the quarterback will be ready for the start of the season.

The Indianapolis Colts have signed Christine Michael to compete for time at running back.

Michael, 26, will join a backfield that already features veterans Frank Gore, Robert Turbin, Josh Ferguson and rookie Marlon Mack.

Gore and Turbin are expected to receive most of the team's carries.