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7/31/2014 9:27 P.M. ET

Luhnow hopes to get an injured outfielder back soon

HOUSTON -- General manager Jeff Luhnow is hopeful that the team will be able to get one of its injured outfielders -- Dexter Fowler, George Springer or Alex Presley -- out on a rehab assignment next week, but he didn't say which one.

Luhnow did say that Springer is ahead of Fowler, but that's not surprising since Springer began taking batting practice this week. Springer hasn't played since July 19 because of a strained left quad.

"Hopefully, all of them are out and swinging by the time our next homestand comes around, and at least one -- if not two and hopefully three -- will be ready to get activated," Luhnow said.

Springer went on the DL a couple of weeks after Fowler went out with a strained intercostal muscle. Presley, who took over for Springer in center field, strained his oblique swinging the bat on July 7. The Astros had been playing Enrique Hernandez in center before trading him to the Marlins on Thursday.

Astros happy for Cosart but sad to see him go

HOUSTON -- While most of the pitchers were warming up on the field a few hours prior to Thursday's game, Jarred Cosart joined them wearing street clothes and began exchanging hugs and handshakes. It was time for goodbyes after he was traded to the Marlins in a six-player deal.

The loss of Cosart didn't come as a complete surprise, considering the Astros were looking to trade a starter, but for some it was still tough to see him go.

Cosart was traded along with infielder Enrique Hernandez and Minor League outfielder Austin Wates.

"It hurts a lot just based on the fact he's a hometown boy and also, he had a chance to do special things here," pitcher Dallas Keuchel said. "He's only 24 years old and showed a lot of promise. I was kind of shocked by it, but it's a business, and everybody is trying to get better. We'll see."

Cosart was close with several of his teammates. He served as best man in Josh Zeid's wedding -- they came to Houston together in a trade with Philadelphia -- and was rooming with Collin McHugh and is best friends with Brad Peacock, who was recently sent to Triple-A.

The trade took Jose Altuve by surprise.

"Kike just got here, and all he did was hit," Altuve said. "That's why he got traded. Cosie, I think he's been one of my best friends here on the team. I feel sad, but at the same time, I'm happy, because I know it's going to be good for them, and I know they're going to have a good career with the Miami Marlins."

Veteran catcher Jason Castro took it all in stride. He's seen numerous trades in his time with the Astros, and every player who was in the lineup with him when he made his Major League debut in 2010 has since been dealt.

"All we can do, what we can concern ourselves with, is preparing to win," Castro said. "When the time is right, we'll be consistent, and we'll put the best team possible on the field. That's really all we're concerned with as players -- playing our game and doing what we can every day to get better."

Brian McTaggart is reporter for MLB.com and writes an MLBlog, Tag's Lines. Follow @brianmctaggart on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.