Lillibridge is a shortstop who also can play third base and other positions. He should have plenty of work after the Braves had shortstop Yunel Escobar and third baseman Chipper Jones leave Friday night's game with injuries.
Escobar, who suffered a strained right hip flexor, was held out of Saturday night's lineup after trying to convince manager Bobby Cox he could play.
Jones aggravated a strained right quadriceps and was expected to miss at least two games. Jones, however, pinch hit in the eighth inning of the Braves' 5-4 win against the Seattle Mariners, singling in Gregor Blanco.
Lillibridge was 0-for-8 and drove in one run in his first stint with Atlanta in April.
Lillibridge was hitting only .207 at Richmond but had three-hit games on Friday and Saturday at Syracuse. He had 15 stolen bases in 54 games.
"[Lillibridge] is our only extra infielder," Cox said, adding he didn't want to send Ridgway back to Richmond "but we had no choice. Somebody had to go, because we had to make a move."
Ridgway had a 4.15 ERA in four appearances.
Information from The Associated Press contributed to this report.