Adam Schefter explains that it's good news that Andrew Luck says he'll be ready for Week 1, but wonders why it will take so long to heal his calf injury. (0:54)

WESTFIELD, Ind. -- Indianapolis Colts quarterback Andrew Luck's absence from the practice field due to a left calf injury will last at least another week, coach Frank Reich said Saturday.

Luck missed the Colts' OTAs and minicamp and has only practiced three days in training camp since originally injuring his calf back in April. He approached the Colts on their off day on July 29 and said he wanted to stop practicing until he felt his calf was 100%.

Luck has been a participant in the team's walk-throughs, where he's taken most if not every one of the snaps in an attempt to stay up to speed with the offense. He has also been working with throwing coach Tom House.

"I feel good about where we're at," Reich said. "Just ramping it up from last week. That was so productive last week that we feel we're on the right track.

"When (Luck) has his throwing sessions, there is some movement in there and we are progressing in that."