CINCINNATI -- Center fielder Drew Stubbs will be out of the lineup indefinitely after injuring his left side on Tuesday night in an 8-4 loss to Pittsburgh.
Stubbs felt pain under his ribs and near his back after fouling off a pitch in the seventh inning. He eventually struck out in the at-bat but went back to his defensive position in the eighth.
He was replaced defensively in the ninth by Wilson Valdez.
Chris Heisey started in center field on Wednesday against the Pirates.
"We're hoping it's just a couple of days, but you have to be real careful with these things," said manager Dusty Baker. "It's in the oblique area, but it's not the oblique. If you end up tearing that thing, you can be out for a long time, and we can't afford that, with his defensive speed and the way he's been coming on lately. He's been swinging the bat better lately."
The Reds are 24-2 when Stubbs scores a run. Though he is hitting .235 overall, he has been productive out of the No. 2 spot in the batting order, hitting .280 with seven doubles, seven home runs, 17 RBIs and 12 stolen bases.
Reds option Costanzo, call up Negron
CINCINNATI -- The Reds optioned infielder Mike Costanzo to Triple-A Louisville on Wednesday and recalled Kristopher Negron to take his place on the roster.
Costanzo had just two RBIs and one hit in 17 at-bats, and he went hitless in his last 11 at-bats. He made just two starts; one at first base and one as designated hitter when the Reds played in New York against the Yankees.
Negron, who is available for Wednesday's game against the Pirates, can play all three outfield positions even though he began his professional career as an infielder. He appeared in 18 games in center field for Louisville, 20 games at shortstop, and 11 games each at third base and second base.
"He's kind of like [Wilson] Valdez but with more speed," said manager Dusty Baker.
The Reds acquired Negron on Aug. 14, 2009, from Boston in exchange for shortstop Alex Gonzalez and cash. He spent all of 2011 with Louisville. He hit just .212 with the Bats in 58 gamesm with 16 RBIs and 15 stolen bases.
Reds draft son of Braves general manager Wren
ATLANTA -- Braves general manager Frank Wren has been involved with many Drafts, but before this year, he had never experienced having one of his children selected.
Wren's son, Kyle, was selected by the Reds in the 30th round on Wednesday. The 21-year-old outfielder will likely return to Georgia Tech to use at least one of his two remaining years of eligibility, but there was still a thrill involved in the selection.
"I'm happy and proud of him to be rewarded for all of his hard work," the senior Wren said. "Even though he has grown up around baseball his entire life, it is still special to see that you have been selected."
Kyle Wren possesses impressive speed and has shown great range while patrolling center field for the Yellow Jackets during the past two seasons. He might spend a second straight summer playing in the Cape Cod League.
"He's a good player" said Chris Buckley, Reds senior director of amateur scouting. "We'll have to see. He's a sophomore-eligible player at a very good school. He needs to get a little stronger. He's not a very physical guy. He kind of wore down as his season went on."
Wren said there have also discussions about his son spending the next few months dedicating himself to building strength. He is listed at 5-foot-10 and 166 pounds in the Georgia Tech media guide.
Wren hit .340 with a .412 on-base percentage and 16 stolen bases in 23 attempts during his freshman season, in 2011. This year he batted .298 with a .346 on-base percentage and 16 stolen bases in 22 attempts.
Kevin Goheen is a contributor to MLB.com. Mark Bowman is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.