Wood agreed to a one-year, $3 million contract with an option for 2013 on Jan. 13, but at that time, the Cubs' 40-man roster was full.
Corpas, 29, is coming back from Tommy John surgery, which he had in September 2010. He had signed a split contract with the Cubs, which means he will make a certain amount of money if he's on the Major League roster, and another amount if he's in the Minor Leagues. Those amounts are prorated based on days of Major League and Minor League service during the particular contract.
In parts five seasons with the Rockies, Corpas was 12-16 with 34 saves, 51 holds and a 3.93 ERA. He was Colorado's closer midway through the 2007 season, and went 4-2 with 19 saves and a 2.08 ERA in 78 relief appearances. If healthy, he could provide some experience to the bullpen.
The Cubs are expected to announce all non-roster invitees at a later date.
Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings, and you can follow her on Twitter@CarrieMuskat. This story was not subject to the approval of Major League Baseball or its clubs.