To make room for Fujikawa on the roster, the Cubs designated outfielder Nate Schierholtz for assignment.
The 34-year-old Fujikawa has missed 14 months following Tommy John surgery. He made his Cubs debut last year after 12 seasons with the Hanshin Tigers in Japan's Central League. Fujikawa was 1-1 with a 5.25 ERA in 12 appearances in 2013 before being injured.
Schierholtz hit a career-high 21 home runs for the Cubs last season, but struggled this year. He was hitting .192 with six home runs and 33 RBIs in 99 games this season.