San Francisco acquired Matzek (elbow) and minor-league infielder Sabin Ceballos from Atlanta on Monday in exchange for right-handed reliever Luke Jackson and outfielder Jorge Soler, Shayna Rubin of the San Francisco Chronicle reports.
Matzek has been out early May while dealing with inflammation in his throwing elbow and isn't expected to return from the 60-day injured list until late August or early September. The left-hander has struggled to a 9.90 ERA and 1.90 WHIP with 10 strikeouts over 10 innings in 11 appearances out of the bullpen with Atlanta this season. Once healthy, Matzek will likely operate in a low-leverage role out of the Giants bullpen.