Canning is slated to work as a bulk reliever in Wednesday's contest versus the Rockies at Petco Park.
Left-hander Kyle Hart will work as an opener ahead of Canning, in a repeat of the arrangement the last time Canning's turn in the rotation came up Thursday in Atlanta. Canning hasn't fared well this season either as a traditional starter (6.79 ERA) or reliever (7.71 ERA), and with the trade deadline looming, his time to make a positive impression could be running out.