Mack Hansen is a major doubt for Connacht's derby game at Munster on Saturday after suffering a thigh injury in Ireland’s win over Australia.Hansen was ever-present in Ireland’s wins over South Africa, Fiji and Australia, scoring tries in the first two matches, but he suffered a knock against the Wallabies and is being assessed by Connacht’s medical staff.Hansen has registered three tries in five appearances for Connacht this season, including the opening score in last month's 20-11 win over Munster in Galway.Connacht director of rugby Andy Friend confirmed Hansen’s Ireland team-mates Bundee Aki, Finlay Bealham and Cian Prendergast are all in contention for the trip to Thomond Park as they begin a demanding 10-game block of BKT United Rugby Championship and Challenge Cup fixtures.