New York Yankees pitcher Michael Pineda will undergo season-ending arthroscopic surgery on May 1 to repair an anterior labral tear.

Dr. David Altchek, assisted by Yankees team physician Dr. Christopher Ahmad, will perform the labral repair procedure at the Hospital for Special Surgery in New York, MLB.com reports.

The lefty started the 2012 season on the disabled list after an MRI exam revealed right shoulder tendinitis. It is unclear whether that injury contributed or was related to the labral tear.

Pineda, acquired from Seattle this offseason in a deal that sent top prospect Jesus Montero to the Mariners, had struggled this spring with velocity. He hit 95-97 miles per hour last season with Seattle, but had mostly been clocked at 91-92 miles per hour this spring.

The 23-year-old Dominican native was vying for a spot in New York's rotation this spring and pitched to an earned run average of 5.68 in six starts. He was tagged for 12 runs on 24 hits and 10 walks in 19 innings.

Pineda was an All-Star during his rookie season in Seattle last year and finished the campaign with a record of 9-10 and a 3.74 ERA in 28 starts.