San Francisco Giants third baseman Pablo Sandoval has a broken hamate bone in his right wrist.
As a result, Sandoval has been placed on the disabled list, needs surgery and is expected to miss 4-6 weeks.
It is unclear how the injury occurred.
Sandoval believes he hurt himself during a slide, but head trainer Dave Groeschner believes he did it swinging the bat. The hamate usually takes the brunt of a swing because that is where players rest the knobs of their bats.
Infielder Ryan Rohlinger will be recalled from the Triple-A Fresno Grizzlies to take his roster spot.
So far, Sandoval is batting .313 with five home runs and 14 RBIs.