The 17-year-old winger is looking to make a breakthrough into the first-team this season.
And Braaf has revealed Guardiola told him he wasn't far away.
The Spaniard said: "I see what you do and you just have to keep going and then your chances will come."
De Bruyne also told the youngster: "I have heard that you are a good player.
"Keep on going and always make your actions, both with your own team and with us on the training. And if things go wrong, then it's just learning, learning, learning and learning."