Jackson (elbow) underwent an appendectomy Monday and is without a timeline to resume his rehab program, Martin Gallegos of MLB.com reports.
Jackson has made two minor-league appearances in the past week as he works on returning from a strained elbow, but his recovery from the appendectomy will put a pause on his rehab indefinitely. He struck out four and allowed two earned runs in two innings across the two rehab appearances. The right-hander has been on the injured list since mid-May.
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