Per general manager A.J. Preller, Espinoza's forearm tightness is not due to any ligament- or elbow-related issues, Jeff Sanders of the San Diego Union-Tribune reports.

Espinoza went in for an MRI on Thursday evening after going on the disabled list with forearm tightness, but the results appeared to have cleared the top prospect of anything serious. The 19-year-old is scheduled to rest 7-to-10 days before beginning another throwing program, which could push his return date into early May.