Ferris and Humphreys add to Ulster woes for Gloucester test
Ferris aggravated a knee injury against Glasgow last week, the same knee that required surgery following Ireland’s summer tour to Argentina.
Accordingly, coach Mark McCall has made three changes to his starting line-up, with Matt McCullough and number 8 Roger Wilson called into the back-row and Neil Best moved from blind to open-side flanker while Carlos del Fava replaces Ryan Caldwell in the second row.