Guardiola twice won the Champions League as Barcelona coach with Messi.
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For many, Yamal is the best to come through the La Masia system since the now Inter Miami star.
Asked about comparisons with Messi, Guardiola told GQ: "I think he should be allowed to move on. And when he's played for fifteen years, we'll decide if he was the best.
"Let him continue his career. The fact that they compare him to Messi is a serious matter. It's like comparing a painter to Van Gogh, and saying: 'Wow, he's not bad, that's a sign that he's good...'."