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Beer will undergo surgery on his dislocated left shoulder Thursday, Nick Piecoro of The Arizona Republic reports.

The 25-year-old remains without a specific timeline for his return, though manager Torey Lovullo said the timeline will be measured in "months not weeks." Beer went 4-for-10 with a home run, a double, three RBI and four runs in his first five big-league games before suffering the dislocated shoulder, and it's unclear if he'll be ready for the start of spring training in February.

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