Jennings pitched two scoreless innings, striking out four without allowing a hit or a walk in Friday's exhibition against Milwaukee.
Aside from one bad outing, Jennings had a strong spring training with 11 strikeouts over nine innings. He was effective for the White Sox in 2016, posting the bullpen's lowest ERA over a career-high 64 appearances. He'll be used similarly in 2017, throwing in the sixth and seventh innings while sometimes getting more than three outs.