PITTSBURGH — Athletics second baseman Zack Gelof is expected to have season-ending surgery on his left shoulder next week, manager Mark Kotsay said Saturday.

Gelof dislocated his shoulder Friday night while diving to field a ground ball in the Athletics’ 4-3 victory over the Pittsburgh Pirates. Gelof was injured during spring training and had surgery to repair a broken bone in his right hand. He was not activated from the injured list until July 4.

“This is really unfortunate for Zack,” Kotsay said. “But he does have a whole offseason to do the rehab, recover and be cleared for spring training.”

In 30 games this season, the 25-year-old Gelof hit .174 with two home runs. He was placed on the 10-day injured list Saturday.

The Athletics also placed left-hander Sean Newcomb on the 15-day I

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