Rodrygo gave Real Madrid the lead before City stormed back to win 2-1 at the Santiago Bernabeu.
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And at the final whistle, Guardiola made a beeline for the Brazilian before speaking with the midfielder.
Asked about the chat, Guardiola said on Movistar+: "I told Rodrygo how good he is.
"He's a player on another level... this guy is a player on another level. I'm happy he's back from injury. He's very, very good."
Rodrygo was linked with a move to City at the end of last season.