Duffey is slated to start Sunday against the White Sox in Chicago, Rhett Bollinger of MLB.com reports.
With Ervin Santana (back) expected to be activated from the DL in order to take the mound Saturday, Duffey has been tentatively penciled into the schedule for Sunday. Duffey's pair of starts this season have been encouraging, especially Saturday's outing in which he gave up four runs (one earned) on five hits and no walks while striking out seven in 6.1 innings against the Tigers.