6:57 PM ET
The team said the surgery involved a hamate excision.
No timetable was given on when the 24-year-old would return to play.
Olson was injured in Thursday’s 5-4 loss in Japan against the Seattle Mariners on a foul tip in his final at-bat, according to the team.
Olson batted .247 with 29 home runs and 84 RBIs in his first full season last year.