ATLANTA -- The Astros placed closer Francisco Cordero on the 15-day disabled list Friday with an inflamed right big toe.

Manager Brad Mills said the toe has been bothering Cordero since July 25. Mills said the closer has been getting treatment, but the injury hasn't improved. He's optimistic a trip to the DL will allow Cordero to get completely healthy.

"It just really hasn't gotten that much better," Mills said. "We thought we wanted to get that well, get him feeling good. Hopefully along the way he'll start throwing the ball like we know he can."

Cordero has struggled since being a part of the 10-player trade the Astros and Blue Jays made July 20. He has given up 11 runs on 13 hits in five innings over six games for Houston.

With Cordero hurt, Mills said the Astros will use right-hander Wilton Lopez as their closer. Lopez is 3-0 with a 2.52 ERA in 39 1/3 innings this season. His 1.14 rate of walks per nine innings is the lowest among Major League relievers.

"He's done such a good job for us all year," Mills said. "He's the guy we want when we want to wrap it up."

Storey earns first big league callup

ATLANTA -- The Astros called up right-hander Mickey Storey from Triple-A Oklahoma City on Friday. Storey replaces injured closer Francisco Cordero on the roster.

This is Storey's first callup to the Major Leagues. He said he found out Thursday when he arrived in the clubhouse in Tacoma, Wash., where the Redhawks are playing a four-game series.

Storey, 26, has been successful at Triple-A this season, going 7-4 with a 3.05 ERA. He has struck out 72 batters and walked just 14 in 65 innings. Storey said he uses a mix of four pitches to attack hitters.

"Keep the ball in the zone, don't throw very hard," Storey said. "Go after guys the best I can and get a good mix in."

Manager Brad Mills said Storey earned the chance at the Major Leagues with his performance this season.

"He's been one of the best relievers they've had," Mills said. "It's kind of exciting to be able to reward somebody like that, that's throwing the ball well and getting a chance at the big leagues."

Storey flew overnight to Atlanta, arriving around 5:30 a.m. CT. He said his wife and daughter would be at Friday's game, with his mother expected to join them this weekend, perhaps as early as Friday night.

Mills said Storey was available to pitch in the opener with the Braves.

Pearce dealing with tightness in neck

ATLANTA -- Astros right fielder Steve Pearce was a late scratch from Friday night's lineup against the Braves. Manager Brad Mills said Pearce had tightness in the pressure point in his neck and couldn't get loose during batting practice before Houston's 4-1 loss.

"He thought he could go, but at the same time, if it's bothering him like it was during batting practice, then I just didn't think it was necessary to put him out," Mills said. "It might be difficult to get him back in there tomorrow, but we'll see."

Ben Francisco replaced Pearce in the lineup and went 2-for-3 with a walk and a run.

Pearce is 3-for-11 in four games since the Astros claimed him off waivers from the Orioles on July 28.

Worth noting

• The Astros and White Sox completed their Brett Myers trade from last month, with Houston acquiring right-hander Chris Devenski as the player to be named. Devenski has been assigned to low Class A Lexington. The Astros dealt Myers to the White Sox for Minor League pitchers Blair Walters and Matthew Heidenreich on July 21.

• The Astros announced Friday two additions to Triple-A Oklahoma City. They signed right-hander Brian Sanches to a Minor League contract and acquired right-hander Garrett Mock from the Red Sox for future considerations. Both Sanches and Mock will report to the Redhawks on Sunday, when Oklahoma City begins a four-game series in Salt Lake City.

• Left fielder J.D. Martinez returned to the Astros' lineup on Friday night after missing Wednesday's game because he injured his elbow when he fell in the dugout Monday. Manager Brad Mills said keeping Martinez out of the lineup Wednesday combined with Thursday's off-day gave him a chance to recover.