Elias is likely to make his first Test start since the opening round of the 2024 Six Nations against Scotland.
Cardiff’s Evan Lloyd is the other hooker in the squad and could make his first international appearance for more than a year, with Dee’s anticipated arrival in South Africa providing extra cover and experience.
Morgan is the obvious choice as captain against the world champions unless Tandy opts to rest the open-side flanker.
Wales slipped to 12th in the world rankings with their loss to Argentina and suffered a record 73-0 defeat by the Springboks in their last meeting in November.
