SCOTTSDALE, Ariz. (AP) -- Arizona pitcher Bronson Arroyo is expected to miss a week to 10 days because of a back injury.
Arroyo was scratched from a scheduled start Tuesday and had an MRI, which revealed a slightly bulging disk.
''We still feel like there's enough time for him to be ready for the beginning of the season,'' manager Kirk Gibson said Thursday.
The 37-year-old right-hander, who agreed last month to a $23.5 million, two-year contract, has never has been on the disabled list in his professional career.
Gibson said Arroyo could pitch in a minor league exhibition when he's ready to return to game action.
''I think he wanted to throw today, but I don't know that was in the cards. Maybe tomorrow,'' Gibson said before the Diamondbacks played Oakland. ''Just kind of want to make sure we're on solid footing before introducing twisting in his back again. He's had this before. It's kind of resolving itself like it has in the past.''
Right-hander Bo Schultz is scheduled to take Arroyo's turn in the rotation Sunday against San Diego.