PEORIA, Ariz. ? Trevor Hoffman already is focusing on his comeback — and not the shoulder operation that will make him miss half the season.

“We’re going to take care of this,” San Diego’s closer said Tuesday after deciding to have surgery. “The ball will be in my court. I’ll do the things in rehab that I need to do to get on the field and pitch. Hopefully, we’ll write a better ending, the way I want it done.”

In 10 major league seasons, the right-hander never has been on the disabled list.

“To lose his ability to close games, which is basically automatic, is going to be tough,” first baseman Ryan Klesko said. “We’ll try to get him back by the end of the year. But right now, this is devastating for us.”

Manager Bruce Bochy said the length of rehabilitation won’t be known until the surgery is performed at the end of the week in Los Angeles by Anaheim Angels medical director Dr. Lewis Yocum.

“It’s a blow when you lose your closer, especially when your closer is one of the best of all time,” Bochy said.

Hoffman, 35, ranks fifth with 352 career saves. Since Bochy took over the Padres in 1995, Hoffman has 327 of the team’s 359 saves — 91 percent.

Hoffman had surgery Oct. 16 to repair a tear in his rotator cuff and fraying of cartilage in the shoulder. Yocum did that procedure, as well as a repair of Hoffman’s rotator cuff tear in 1995.

An MRI last week revealed no additional damage to the rotator cuff but showed arthritic degeneration of the clavicle. Doctors will shave the edge of the clavicle — the collarbone — to reduce irritation and give tendons more room.