Hat-trick hero Isco said it was a relief to play for Spain as he feels Real Madrid coach Zinedine Zidane has no faith in him.
Spain destroyed Argentina, who were without Lionel Messi, 6-1 in a friendly on Tuesday as Isco stole the show with his triple at the Wanda Metropolitano.
The 25-year-old has become a key player under coach Julen Lopetegui and is expected to start at this summer's World Cup in a front three alongside Diego Costa and David Silva.
But Zidane has not shown the same faith in him at Real Madrid, where Isco has often found himself on the bench behind the likes of Marco Asensio and Lucas Vazquez.
"Lopetegui gives me confidence with minutes, with games," Isco said.
"With Madrid I do not have the confidence that a player needs, maybe the problem is me, that I have not won Zidane's confidence with the good players there."
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"I feel that I'm at the beginning and I want to show that I am a good player."
"During the nine months I went without being called up by Spain I felt bad," Costa said. "I went six months without playing as you all know, but I knew that if I started playing again I would have a chance of returning, and I'm happy to be here."
"I think I will be fit to play Sunday," Costa said. "I took a knock, I'll put ice on it and that's all."