He's a proven Major League pinch-hitter, especially against left-handed pitching, and his acquisition provides management with depth that will be needed if the club trades away a veteran outfielder.
"When you look at the landscape, one thing there's a scarcity of is offense," Zaidi said. "We're fortunate to have a surplus of offensive outfielders, and we are assessing the demand and interest in them."
Heisey, who turns 30 on Dec. 14, is a right-handed hitter who had a .222 average in 275 at-bats this year with eight home runs and 22 RBIs. He was a non-tender candidate with the Reds after receiving $1.76 million in 2014. He still has Minor league options. The Dodgers tendered Heisey a contract before Tuesday night's deadline.
Heisey appeared in 119 games at all three outfield positions for the Reds in 2014, his fifth Major League season. In 47 pinch-hit appearances, he hit .273 (12-for-44) and led qualifying NL pinch-hitters with four home runs and a .659 slugging percentage.
Zaidi said he and other Dodgers executives had considered acquiring Heisey for their previous clubs.
As a right-handed hitter that can play all three outfield positions, Heisey's presence could free the Dodgers to include outfielder Scott Van Slyke in a trade.
Magill, who was the 19th-ranked Dodgers prospect, spent the entire 2014 season at Triple-A after making six starts and going 0-2 with a 6.51 ERA with the Dodgers in 2013. He was made expendable with the recent acquisitions of right-handed pitchers Juan Nicasio and Mike Bolsinger.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.