Larnach underwent surgery on his left wrist Friday, Dan Hayes of The Athletic reports.
Larnach's wrist forced him onto the injured list in mid-September, putting an early end to a strong season in which he slashed .269/.352/.436 across 433 plate appearances. Assuming his recovery goes smoothly, the 29-year-old is expected to resume a full hitting program in January and should be ready to go by the time spring training begins.