After further investigation, it was decided that surgery was required to resolve the injury. Hogg was last week operated on successfully by ankle specialist John McKinley at Spire Murrayfield Hospital and is progressing well. The 20-year-old is expected to be unavailable for selection for up to eight weeks.
Lock Tim Swinson, meanwhile, will be out of action for three to six weeks after sustaining a facial injury in last Saturday's game away to Sale Sharks.
Hooker Pat MacArthur is undergoing assessment for a foot complaint, with further investigation due to take place next week.
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