Matias Moroni insists Michael Cheika is making Argentina believe that they are good enough to defeat any team in the world.
The Pumas face England at Twickenham on Sunday, with the aim of keeping momentum going after a Rugby Championship that saw tem defeat both Australia and the All Blacks.
Ex-Australia boss Cheika, who guided The Wallabies to a World Cup final in 2015, has been credited with reshaping Argentina's fortunes.
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He steps down after next year’s global showpiece in France and Newcastle three-quarter Moroni believes his grasp of player psychology is already having a profound impact.
“Michael has been working with us and the most important thing is the mentality. He has started to show us if we want it, we can do it,” Moroni said.
“He has been working with us on our mentality and giving us the confidence that we have a great team and great players. It’s showing in those of us playing in the Premiership and in France.”
Moroni swapped Leicester for Newcastle over the summer and departed Welford Road with a high opinion of the leadership skills of Ellis Genge, who will start at prop for England on Sunday.
“The way he led when we played at Leicester was by doing things,” he said.
“He talked really well also but also did his talking on the pitch and through the way he trains, the way he plays, the way he carries.
“He pushed the team to win the Premiership title last season but this weekend we are on different teams.”
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