Messi took the game away from City late on but Guardiola took several positives despite a 2-0 Champions League defeat in the Parc des Princes on a night that saw Liverpool thrash Porto 5-1.
The City manager heaped praise on his old prodigy, claiming it was impossible to thwart him for the entire game.
‘The (Messi) goal was fantastic,’ Guardiola said. ‘We know it’s impossible to control Leo during the whole 90 minutes but he was not much in touch with the ball.
‘We know quite well when he can run and get close to the box he is unstoppable. We knew it already, we spoke about that, we cannot control them for 90 minutes, these huge talents.
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