Right-hander Shaun Marcum will undergo season-ending surgery Monday to correct the numbness and tingling in his right arm, assistant general manager John Ricco announced Tuesday.

Marcum was placed on the disabled list and reliever Gonzalez Germen was recalled from Triple-A Las Vegas to take his spot on the roster.

Marcum was examined by specialist Robert Thompson in St. Louis Tuesday and was diagnosed with thoracic outlet syndrome, which infers Marcum has an artery that is impeding circulation.

"It’s affecting his ability to grip the baseball," Ricco said.

Marcum was presented with two alternatives — surgery or physical therapy — and elected the operation.

Thompson will perform the procedure. Thompson also performed the season-ending surgery on Dillon Gee last summer.

Marcum cannot begin throwing for at least two months, eliminating a chance of pitching again this season.

Marcum, 31, began the season on the disabled list with a neck impingement, but missed just one start. He went on to go 1-10 with a 5.29 ERA in 14 appearances (12 starts).

He was one of just two players the Mets signed to a major-league contract over the offseason. The other, Brandon Lyon, was designated for assignment last week.

The deal was worth $4 million plus another $4 million in possible incentives.

Manager Terry Collins said Carlos Torres would replace Marcum in the starting rotation until Jon Niese returns from his shoulder injury.

"We’re starting to run out of options and that’s where Jon Niese becomes a huge factor," Collins said.