Contreras will be recalled from the alternate training site Sunday, David O'Brien of The Athletic reports.
The 23-year-old was called up as the 27th man for last weekend's doubleheader, and he'll rejoin the major-league club Sunday with Travis d'Arnaud (thumb) heading to the injured list. Contreras and Alex Jackson will handle catching duties for Atlanta until d'Arnaud recovers from the injury.