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8/14/2013 1:58 P.M. ET

Rangers acquire left-hander Blackley from Astros

ARLINGTON -- The Rangers acquired left-hander Travis Blackley from the Astros in exchange for cash considerations on Wednesday. He will be sent to Triple-A Round Rock and not be placed on the club's 40-man roster.

Blackley went 1-1 with a 4.89 ERA in 42 relief appearances for the Astros this season. He was designated for assignment by Houston on Friday and outrighted to Triple-A Oklahoma City on Saturday. The Austrailia native is 8-8 with a 5.28 ERA over 78 games (23 starts) in his four-year big league career.

The move occurred a day after Rangers general manager Jon Daniels announced Matt Harrison would be out for the season with a lingering back issue. The club recently also lost Colby Lewis for the season due to bone spurs in his right hip.

"We'll look; I think if there is something, it'll be more than likely in the protection category," Daniels said Tuesday. "We may look for some depth. I don't really have any expectations that we'll add a starting pitcher that will crack our starting five. You can always improve your depth, and that's what we're looking at."

Master Tesfatsion is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.