Both clubs have significantly strengthened their squad in the summer after disappointing seasons a year ago when they failed to maintain a significant challenge to champions Chelsea.
'For the moment I think so, but everybody's still there, ' the Belgian playmaker told ESPN FC.
"Normally when we play worldwide games, I make decisions the night before or the same day to see how the players feel".
De Bruyne believes City are producing the types of performances their Spaniard boss wants.
The two rivals occupy first and second spot in the Premier League table, with Tottenham, five points adrift of City, their nearest competition, while reigning champions Chelsea are nine points worse off in fifth place.
De Bruyne and City have made a scintillating start to the campaign, winning seven and drawing one of their opening eight games to be two points clear at the top.
League leaders City have netted 17 goals in their last three home matches, including one of the most ruthless attacking displays of the season when they thrashed Stoke City 7-2 last weekend.
"I'm just growing on what I've done the last years", he added.
"I think past year we played good football but especially in the big games we didn't win them", De Bruyne added.
"Always we can do better. But we'll put hard work into it and we have to keep going".
"Chelsea are going to be competing, they are going to be taking points off all of the teams around them, but I think ultimately the teams with the deepest squads - Man City and Man Utd will be very close [to winning the Premier League title]".
That City is being mentioned in such terms owes much to De Bruyne's stellar form but the ex-Chelsea man is keen to share the credit around.