OAKLAND, Calif. — The Oakland Athletics traded All-Star closer Andrew Bailey and outfielder Ryan Sweeney to the Boston Red Sox on Wednesday for outfielder Josh Reddick and prospects Miles Head and Raul Alcantara.

In the deal, first reported by ESPN, new Red Sox manager Bobby Valentine has found a reliable ninth-inning guy in Bailey to replace the departed Jonathan Papelbon, who signed a $50 million, four-year contract as a free agent with the Philadelphia Phillies in November.

Bailey — the 2009 AL Rookie of the Year who made the All-Star team that season and again in 2010 — has been the subject of trade talk this offseason.

The right-handed Bailey, 27, went 0-4 with a 3.24 ERA and 24 saves in 41 2/3 innings this year. He spent time on the disabled list for the second straight season, pitching for the first time in 2011 on May 29 after being sidelined with a strained right forearm.

Bailey becomes the fourth key pitcher traded this month for the rebuilding A’s, who dealt starter Trevor Cahill and reliever Craig Breslow to the Arizona Diamondbacks on Dec. 9 and then sent left-handed starter Gio Gonzalez to Washington last Thursday.

Reddick will look to fill a big void in Oakland’s open outfield.

The 24-year-old Reddick batted .280 with seven homers and 28 RBIs in 87 games for Boston in 2011. He can play any outfield spot and likely will get immediate action for the A’s, who already lost outfielders David DeJesus and Josh Willingham in free agency. Center fielder Coco Crisp isn’t expected to return either.

Oakland general manager Billy Beane is retooling his roster for the future in hopes of the franchise getting the go ahead to build a new ballpark some 40 miles south in San Jose despite the San Francisco Giants owning the territorial rights to technology-rich Santa Clara County. Beane and owner Lew Wolff have said they expect to hear soon from Commissioner Bud Selig, and Beane said the unsettled stadium situation would affect him being able to sign his own free agents this winter.

The A’s (74-88) haven’t posted a winning record or earned a playoff berth since being swept in the 2006 AL championship series by Detroit.

At last summer’s trade deadline, the A’s and Red Sox were near completion on a deal that would have sent Oakland right-hander Rich Harden to Boston for Triple-A first baseman Lars Anderson but it fell through late because of Harden’s lengthy list of injury issues.

Former Red Sox pitching coach Curt Young returned to the A’s this offseason to work under manager Bob Melvin