Matzek (elbow) signed a minor-league contract with Atlanta on Saturday and will report to Triple-A Gwinnett.
Matzek has spent parts of the last five-plus seasons with Atlanta and had occupied a spot on the big club's 60-day injured list before he was dealt to the Giants in July. The left-hander began a rehab assignment with the Giants' Triple-A affiliate Aug. 13, but he wasn't activated before San Francisco released him last week. Now back in the Atlanta organization, Matzek is ostensibly healthy now after making five rehab appearances and will look to impress at Gwinnett over the next couple of weeks with the hope of earning a promotion to the big club.