Gregerson (hamstring) fired two scoreless innings in which he allowed three hits and recorded two strikeouts during his Thursday and Friday rehab outings with High-A Palm Beach, and he could be activated at some point during three-game series with the Cubs that begins Monday, Joe Trezza of reports.

The right-hander hasn't given up a run over his four rehab appearances while compiling six strikeouts overall. Gregerson hasn't experienced any setbacks, and after pitching on back-to-back days, he's likely ready to make his 2018 major-league debut. That development could unfold within the next couple of days, according to Trezza's report, giving manager Mike Matheny a third veteran option with closing experience alongside Greg Holland and Bud Norris.

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