Jorge Posada will have season-ending surgery on his right shoulder, ending his attempt to return to the lineup for New York’s postseason push.

Posada has struggled with shoulder pain most of the season, weakening his throws and limiting his playing time behind the plate.

On the disabled list for the second time this year, Posada was trying to rehabilitate his shoulder enough to come back as a DH or first baseman this season. But after the Yankees acquired outfielder Xavier Nady in a trade with Pittsburgh on Saturday, they determined it was best for Posada to have surgery now, general manager Brian Cashman said Monday.

“It’s just the obvious way to go,” Cashman explained.

Posada is expected to be sidelined at least six months and it’s not certain that he’ll be ready for the start of spring training in February, Cashman said.

“As difficult as it is, I can focus on coming back 100 percent for next season instead of coming back at less than that now,” Posada said in a statement. “Until then, I still plan on being a teammate and friend to the guys I share this room with. I may not be playing, but I want to be a part of this team and the run that we’re on.”