Morgan exercised the opt-out in his minor-league contract with the Astros and became a free agent Sunday, Chandler Rome of the Houston Chronicle reports.
Manager Dusty Baker said Sunday that Morgan won't be included in the Astros' Opening Day bullpen, Brian McTaggart of MLB.com reports.
Morgan (2-1) earned the win Wednesday over Pittsburgh. He walked one and struck out one in a scoreless inning.
Morgan (1-0) tossed a scoreless inning of relief and earned the win Sunday against the Brewers. He walked one.
Morgan was activated off the bereavement list Friday, Gordon Wittenmyer of NBC Sports Chicago reports.
Morgan was placed on the bereavement list Friday, Meghan Montemurro of the Chicago Tribune reports.
Morgan secured a save while tossing a perfect ninth inning in Monday's 4-3 win over the Reds.
Morgan earned the save against the Rockies in Game 1 of Wednesday's doubleheader with a perfect inning.
Morgan's contract was selected by the Cubs on Tuesday, Tony Andracki of Marquee Sports Network reports.
Morgan (elbow) has allowed four baserunners (two hit batsmen, one hit and one walk) while striking out seven across five innings over his first four appearances at Triple-A Iowa this season.