The Belgian struck a superb free-kick shortly after the start of the second-half and that turned out to be the winning goal in a closely-fought 1-0 win at the King Power Stadium.
The City boss says De Bruyne has nothing whatsoever to prove, but his display against the Foxes had everything he is looking for in his world class playmaker.
“Kevin can do the free kicks and do the assists, we know it,” said Guardiola.
“He is a player who needs his dynamic. If he stays in his position, it is not his top (level).
“His top is if he has the freedom to move into the pocket, or lateral, or to the right, or to the box - he has the freedom and he has quality.
“Kevin needs movements, not being quiet in one position. And today he is back. It’s not that he cannot do it - we are seven seasons together - we have done everything except sleep together! We have done everything!
“I know him quite well. Nothing is going to change my opinion of what he has done for this Club and for me personally. But I have the duty in my job to say, ‘I want more’.
“I want this Kevin and we need this Kevin. The game against Brighton he scored a fantastic goal - but it is not enough.
“The goals and assists he can do blind. But we need this type of involvement in the game. And today that was the case.”
