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NEW YORK (Reuters) - The Oakland Athletics signed free-agent right-handed pitcher Ben Sheets to a one-year deal on Tuesday, bringing a veteran arm to a young rotation.

The four-time All-Star missed last season while recovering from elbow surgery on his throwing arm, but the 31-year-old Sheets said he is confident he will quickly return to form.

"I am pretty sure when I get back up there that all my instincts that I have learned in the past is going to come back so I am not really that nervous," Sheets told a news conference. "I feel renewed for the game and I am really keen to get back out there and compete."

Oakland did not disclose financial terms of the deal but said it expects Sheets will be a leader on the team's young pitching staff that ended last season with the third-best ERA in the American League.

Sheets, who spent his first eight major league seasons with the Milwaukee Brewers, went 13-9 with a .309 ERA during 31 starts with Milwaukee in 2008 before having an operation last February on the elbow of his throwing arm.

Oakland went 75-87 last season and finished last in the American League's West Division.

(Writing by Frank Pingue in Toronto; Editing by Justin Palmer)