CHICAGO -- Astros reliever Francisco Cordero, who's been out since Aug. 2 with an injury to his right foot, is feeling better and hopes to be able to go on a Minor League rehab assignment soon.

It's unlikely Cordero will be activated before rosters expand on Sept. 1.

Cordero is still wearing a protective boot on his right foot, which is a treatment for the sesamoiditis he's experiencing. That's the same ailment that forced former Astros infielder Jeff Keppinger to undergo foot surgery a couple of years ago, but Cordero has avoided that.

"It's better by the day, and hopefully I can go on a rehab assignment soon," Cordero said. "It's going to be a little bit faster [to heal] than I thought, and that's helped me out. I don't know the days or when they plan to send me on a rehab, but hopefully I can come back sooner [than Sept. 1]."

Cordero, who flew to Miami on Wednesday to take another step toward gaining his U.S. citizenship, has appeared in only six games with the Astros since coming over in a trade with the Blue Jays. He's allowed 13 hits and 11 runs in five innings, while blowing two saves and going 0-3.

Bogusevic feeling growing pains in first full season

CHICAGO -- When the Astros drafted Brian Bogusevic, they were in a middle of a season that would result in their only trip to the World Series. That was 2005, when Bogusevic was a two-way superstar who led Tulane to the College World Series.

Bogusevic's future as a pitcher fizzled after he went 14-21 with a 5.11 ERA in 77 career Minor League games, and the Astros moved him to the outfield in 2008. This season will mark the 28-year-old's first full year in the Majors, and the growing pains are still evident.

"I had expectations for myself that I didn't really play up to, but at the same time, I feel like it's been a good learning year, and I've gained experience," he said. "It's my first full season, so there's a lot of stuff I haven't seen before. You have to take it as a learning experience and move on."

Bogusevic entered Wednesday hitting a disappointing .214 with six homers and 23 RBIs in 304 at-bats, which are 100-plus at-bats more than he had coming into this season. The Astros rewarded him with a job in the outfield to start the year after he batted .287 with four homers and 15 RBIs in 164 at-bats last year.

"Honestly, there's the experience of just facing that level of pitching day to day, but at the same time, there's things I learned about myself and what I need to do to keep my swing right and things I need to work on to be ready," he said.