Jefferies was added to the Athletics' 40-man roster Wednesday.

The 24-year-old's addition to the 40-man roster protects him from the Rule 5 draft after he recorded a 3.66 ERA with a 72:7 K:BB over 64 innings with Double-A Midland last season. Right-hander Jharel Cotton was designated for assignment in a corresponding move. Although Jefferies was effective at the Double-A level in 2019, he'll likely need more time against better minor-league competition before making his major-league debut.

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