Apr 29, 2014, 7:18 PM EDT
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.
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