Lehtonen has missed three games since sustaining a lower-body injury after replacing Antti Niemi during the second period of a 7-4 loss to Ottawa on Nov. 24.
Niemi has made the majority of the starts after joining Dallas in the offseason. But Lehtonen, the starter the previous five seasons, is 9-1 in 10 starts and has a slightly better goals-against average and save percentage than Niemi.
Campbell didn't appear in a game in his brief stint. He was sent back to the Texas Stars of the AHL on Wednesday.
Dallas visits Vancouver on Thursday night.