Left-hander Chris Rusin, who made his second career start in Washington on Tuesday against the Nationals, was added in addition to catcher Anthony Recker, right-hander Jaye Chapman and right-hander Rafael Dolis. All four players were with Triple-A Iowa before moving to Tennessee once Hurricane Isaac prematurely ended Iowa's season.
Rusin's first start came in Milwaukee on Aug. 21, a five-inning outing in which the 25-year-old rookie allowed one run on one hit but was still tagged with the loss as the Cubs fell to the Brewers, 5-2.
Recker, 29, was traded from the A's on Aug. 27 for catcher Blake Lalli. He was on Oakland's Opening Day roster but was optioned to Triple-A Sacramento on May 27, where he was hitting .265 with nine home runs and 29 RBIs before being designated for assignment on Aug. 20.
Dolis served as the Cubs' closer for a brief stint earlier this season. In 27 games, Dolis, 24, went 2-4 with four saves and a 6.44 ERA in 29 1/3 innings pitched.
While manager Dale Sveum said Recker will likely play only in emergency pinch-hit or pinch-run situations, Dolis will be available out of the bullpen.
"Right now, he's another body in the bullpen that we're going to need down the stretch for innings," Sveum said. "There's no role; he's going to be down the pecking order, so to speak, when we're losing ballgames or just need innings. I do want to get another look at him somehow, to see if things have gotten better than when he left it."
Chapman, a 25-year-old rookie, joins the first Major League roster of his career. The Cubs acquired him in the Paul Maholm and Reed Johnson trade with Atlanta on July 30, which also netted them right-hander Arodys Vizcaino.