Lawrence, 29, last started on April 27, when he gave up six runs on 10 hits over five innings in a loss to the Cardinals. He also allowed five runs (four earned) on eight hits in 6 1/3 innings in a loss to the Angels on April 22 while filling in for Toronto's short-handed rotation.
Lawrence will be available in long relief out of the bullpen for now, and he could be in line to fill De Jong's next scheduled start Sunday against the White Sox at Safeco Field.