Clarke was returned to the Cubs on Saturday after failing to make Seattle's Opening Day roster, Maddie Lee of the Chicago Sun-Times reports.
Clarke was selected by the Mariners in December's Rule 5 Draft, and the right-hander struggled with a 5.40 ERA and 1.50 WHIP over 6.2 innings in the Cactus League. He returns to the Chicago organization, where he'll likely be a bullpen option for Triple-A Iowa during the 2023 campaign.