"There are certain things we want to talk about, and that's the biggest thing," he said. "There are some things we need to work on and things we need to get tightened up in how we play. I think with the guys we have here we need to work on some of those things, and we'll talk about tightening some things up."
The Astros were 22-23 through 45 games, but entered Friday having lost 28 of their last 38 games to fall to the bottom of the NL Central standings.
Mills said some of the reasons the Astros have struggled have had to do with the schedule. They used a four-man pitching rotation early in the season and took advantage of frequent off days to rest the bullpen, a bullpen which has been hit hard in recent weeks.
The Astros are 0-7 in extra-inning games, including 0-6 on the road, and have yet to score a run in extra innings. They've also been outscored 42-16 in the ninth inning and watched the opponent win 13 games in the last at-bat.
"There are adjustments we have to learn simply because we have such a young club," Mills said.