Wales head coach Warren Gatland has made five changes to the side that beat Argentina last weekend ahead of the second and final Test.
Ellis Jenkins, Tomas Francis, Ryan Elias, Aled Davies and Owen Watkin have been called into the squad while forward Cory Hill keeps hold of the captain's armband after leading the side to a commanding 23-10 win over the Pumas at San Juan.
Elias and Francis will get their first starts of the tour as they join Rob Evans in a new-look front row while Jenkins is part of a highly competitive back row that also features James Davies and Ross Moriarty.
Watkin replaces injured centre Hadleigh Parkes while prop Samson Lee misses out due to a back injury.
Wales are in prime position to win all three of their tour matches having edged out South Africa in the first Test before beating Argentina for the first time in 14 years.
"We want to go home three from three but we know the challenge that we are up against this weekend and we also are looking at the bigger picture," Gatland said.
"We might have picked a slightly different team if it was just about results but it is about more than that it is about building for 2019 and we are on the right track."
The final test of the tour will be played at the Estadio Brigadier Lopez in Santa Fe.
WALES: Hallam Amos, Josh Adams, Scott Williams, Owen Watkin, George North, Rhys Patchell, Aled Davies, Rob Evans, Ryan Elias, Tomas Francis, Adam Beard, Cory Hill(capt), Ellis Jenkins, James Davies, Ross Moriarty. Replacements: Elliot Dee, Nicky Smith, Dillon Lewis, Bradley Davies, Josh Turnbull, Tomos Williams, Gareth Anscombe, Tom Prydie.
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