Bray, on the disabled list since April 24 with a strained left groin, has now made four total appearances (two with Class A Dayton and two with Louisville) and logged two-thirds of an inning (two hits, two earned runs, one walk, one strikeout, 25 pitches) in the 4-1 loss Friday night.
"Bray gave up a couple runs, but he finished strong," Reds manager Dusty Baker said.
The southpaw has thrown a total of 3 2/3 innings, allowing two hits, two runs, two walks while striking out eight.
"We want to make sure Bray is not only ready, but over-ready," Baker said. "The bullpen has been pretty tight and we want him to come in and complement things. ... It's always nice to have one more lefty."
Rolen, on the 15-day DL since May 12 with a strained left shoulder, began Friday night what is expected to be a two-game rehab stint with Louisville (1-for-3 with a strikeout). He is expected to rejoin the club Monday in Cleveland.