After his double in the win against Real Madrid, Alvarez also struck a goal in the Champions League triumph against Eintracht Frankfurt.
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Former Real Madrid GM Valdano said: "He plays like a god and runs like nobody else.
"This attitude has an extraordinary contagious effect.
"If the best player on the team puts in this much effort, what's left for the rest of the group to do? Follow his example.
"Julian's level is constantly improving, and I don't think he's reached his limit yet."