Donaldson will serve as the DH and bat second against the White Sox on Tuesday, Brendan Kennedy of the Toronto Star reports.
Donaldson was hit by a pitch over the weekend that has left him with a bruised thigh, so he'll be relegated to DH duties for the second straight game. Given that he's been able to stay in the lineup, it doesn't appear to be a major concern but it may keep him out of the field for the time being.