The roster moves were made Friday before the Indians played the Tampa Bay Rays.
Duncan missed two games while on the paternity list to be with wife Elyse, who delivered twin boys William and Walker on Thursday.
Duncan is hitting .221 with seven homers and 24 RBIs in 55 games.
Donald has split this season between Cleveland and Columbus. In 18 games with the Indians, he hit .188 with four RBIs.