Vannett will have an MRI after injuring his knee during Monday's preseason game against Jacksonville, Ian Rapoport of NFL Network reports.
Fellow Saints tight end Adam Trautman suffered a foot/ankle injury in the contest, and Garrett Griffin (undisclosed) didn't play at all. Trautman is the favorite to lead the group in targets if his injury isn't too serious, while Vannett could have a blocking-heavy role similar to the one Josh Hill filled in recent years. All the injuries could also create an opening for Juwan Johnson, a converted wide receiver who reportedly has looked good at training camp.