Arrieta (hamstring) threw a successful 42-pitch bullpen session Saturday, Bruce Levine of The Score reports.

Everything apparently went off without a hitch, but the Cubs will wait and see how Arrieta responds Sunday before determining when he'll return to the mound. If he checks out, Arrieta is expected to pitch in one of Chicago's pivotal games against the Brewers in Milwaukee next weekend. He owns a 3.48 ERA and 1.20 WHIP across 160.1 innings this season.

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