Angels outfielder Justin Upton was ruled out for the rest of the season with patellar tendinitis, the team announced after Friday night's loss to the Rays.

Upton, who had an MRI earlier this week after complaining of right knee discomfort and missed his second straight game Friday, will receive a platelet-rich plasma injection and will need six weeks of recovery. He is expected to be ready for spring training in 2020.