They take to Stadium Australia in Sydney to face Joe Schmidt’s Wallabies for the final time having beaten them twice already.
Andy Farrell’s side won the first Test 27-19 in Brisbane, before a narrow but thrilling 29-26 victory at the Melbourne Cricket Ground to seal the series win.
The tourists’ head coach has made just two changes to his line-up for this weekend’s encounter, with Blair Kinghorn replacing James Lowe on the left wing, and James Ryan coming in for Ollie Chessum at second row.
It should be a thrilling occasion, with the game being the final Lions match for another four years before the tour of New Zealand in 2029.
How to watch Australia vs Lions
TV channel: Live coverage of the Third Test is available via Sky Sports, who have exclusive broadcasting rights to the Lions tour in the UK this summer.
Their broadcast starts at 9:30am BST on Saturday morning on both Sky Sports Main Event and Sky Sports Action.
Live stream: Fans with a Sky Sports subscription can also watch the Third Test live online via the Sky Go app, while it’s available to stream via NOW.
Live blog: Follow the Third Test action with Standard Sport’s live blog.