Seattle ? Oakland Athletics starting pitcher Esteban Loaiza has a bulged disk in his neck that will delay his season debut by at least a week.

A’s assistant general manager David Forst said an MRI taken in Oakland, Calif., Tuesday showed the inflamed disk was the cause of the spasms that Loaiza was having in his right trapezius muscle.

“It’s not herniated. Not surgical. It’s something that can be treated,” Forst said before Tuesday’s game against Seattle, an 8-4 loss.