Cubs third baseman Mike Olt is heading to the disabled list after an MRI revealed that he has a hairline fracture of his ulna, according to the Daily Herald. 

Olt will have his wrist in a cast for three weeks. With Olt down, the Cubs are calling up third-base prospect Kris Bryant on Friday. 

Olt is hitting .154 on 13 at-bats to start the season.