ATLANTA -- Astros closer Francisco Cordero will visit a doctor next week in Houston to get more information about the inflammation of his right big toe that forced him onto the 15-day disabled list on Friday.

"We want to make sure he's able to see a doctor to see if there's anything else they need to do with that," Astros manager Brad Mills said.

Cordero's injury has been diagnosed as right foot sesamoiditis, the same injury former Astros infielder Jeff Keppinger had in September 2010. He eventually required surgery to remove the sesamoid bone.

Mills said there hasn't been a discussion about whether Cordero will need to have surgery, which would end his season, but he said next week's trip to the doctor will help clarify the next steps.

"Hopefully something like that really isn't necessary," Mills said.

Cordero has pitched in six games for Houston since he was acquired from the Blue Jays in a 10-player deal on July 20. He has allowed 11 runs and 13 hits in five innings.

Pearce out again due to tightness in neck

ATLANTA -- Astros right fielder Steve Pearce was out of the lineup with tightness in the pressure point in his neck for the second straight game on Saturday against the Braves. Ben Francisco again replaced Pearce in right field.

Pearce was a late scratch in Friday's series opener, won by the Braves, 4-1. Astros manager Brad Mills said Pearce felt better Saturday, but he didn't want to take a chance.

"He's much better and I'm hoping he'll be able to get back in there tomorrow," Mills said. "He's moving around pretty good right now, so we're hoping that will come around."

Mills said Pearce may be available to pinch-hit on Saturday.

"Yesterday, when he was loose around the cage, he thought he could probably pinch-hit," Mills said. "But then you cool down during the game without a whole lot of activity and it would have been awful hard."

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

Castro goes 2-for-2 in first rehab game

ATLANTA -- Astros catcher Jason Castro played in his first rehab game on Friday night since going on the 15-day disabled list with a right knee effusion on July 8. Castro caught three innings and went 2-for-2 for Double-A Corpus Christi.

Astros manager Brad Mills said the club is looking forward to getting Castro back, but doesn't want him to rush through rehab.

"We're going to try and measure that a little bit," Mills said. "We want him back, obviously, as soon as he can get back here, but not until he's ready. Somewhere between there is what we'd like him to do because we'd like him back as soon as possible."

Castro was hitting .254 with a .330 on-base percentage before the injury. Chris Snyder has taken over as the Astros' regular catcher since Castro's injury.