A.J. Griffin to undergo Tommy John surgery Wednesday

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Athletics assistant general manager David Forst refuted a report last week that right-handed starter A.J. Griffin was headed for season-ending Tommy John surgery. But there’s no more refuting it now.

CBS Sports’ Jon Heyman confirmed Tuesday that Griffin will indeed undergo the reconstructive elbow procedure, and Susan Slusser of the San Francisco Chronicle says it’ll happen Wednesday in Houston.

Griffin was shut down in the middle of spring camp with right elbow discomfort and later got diagnosed with a flexor muscle strain. He will now be sidelined through at least the first month of the 2015 season.

Griffin, 26, owns a 3.60 ERA and 1.126 WHIP in 282 1/3 career major league innings.

The A’s also lost Jarrod Parker to Tommy John surgery earlier this season.