Cardiff fly-half Jarrod Evans, who has recovered from an ankle injury, is named as one of three backs on the bench alongside Williams and Saracens centre Nick Tompkins.
Pivac said:"Argentina provide the perfect opponents for us this weekend and are the exact test we want for this group of players. "We will be tested up-front, and the physicality will be at a level that some of these players have not experienced before, but that will answer a lot of questions for us as we build towards Rugby World Cup 2023.
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