The site, which employs about 900 staff plus additional seasonal staff, makes ready-to-eat snack salads and prepared potatoes for Marks & Spencer.
A spokesman told FoodManufacture.co.uk: "The site has been earmarked for expansion, primarily to ensure that it has sufficient capacity to meet the seasonal demand that comes with producing salad products."
Local press reports that a factory extension would create up to 50 jobs this spring/summer were premature, he said: "It's too early to talk about how many jobs could be created or when this will happen. Talks are ongoing as to the timing of the expansion project."