Gareth Thomas will make his first start for Wales on when they take on Argentina on Saturday afternoon, K.O 3pm.
Ospreys teammates Sam Parry and Rhodri Jones are given their first opportunity of the Summer and named on the bench.
“We were all frustrated after drawing last weekend and felt we left a number of opportunities out on the pitch,” said Pivac.
“Argentina brought what we expected, they were big, physical and direct and exerted pressure with their kicking game. For some of this group, it was the first time they have faced that level of physicality and intensity and this week we will need to be much more accurate and disciplined.
“It is another exciting opportunity to face a quality outfit and we can still win the series, which would be a great way to finish our season.
“We have freshened the squad up a bit, giving others an opportunity to impress and they are eager to make a big impression.”
15. Hallam Amos
14. Owen Lane
13. Nick Tompkins
12. Jonathan Davies (C)
11. Tom Rogers
10. Jarrod Evans
9. Tomos Williams
1. Gareth Thomas
2. Elliot Dee
3. Leon Brown
4. Ben Carter
5 . Will Rowlands
6 . Josh Turnbull
7. James Botham
8. Ross Moriarty
Replacements
16 . Sam Parry
17. Rhodri Jones
18. Dillon Lewis
19. Matthew Screech
20. Taine Basham
21. Kieran Hardy
22. Callum Sheedy
23. Uilisi Halaholo