"I'm pleased with scoring and keeping a clean sheet - that's pleasing for us defenders!"
After mauling Liverpool 5-0 in the Premier League on Saturday, City now travel to face the Dutch champions - who face a daunting prospect after a 15-year absence from the group stage of the competition.
"Last season we couldn't win one game away from home and we spoke about that. It's important to see if we can go away and play with an attacking mentality, not conceding counter-attacks".
Pep Guardiola tells Manchester City centre-back John Stones to improve certain aspects of his game in order to become "an exceptional central defender".
"It's a pleasure to play like this because the level of the players is so high", said De Bruyne, having finished the match wearing the captain's armband after a flurry of substitutions.
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Their reunion in Manchester got off to a rocky start as Toure returned to pre-season training overweight and was then banished from the first-team picture after his agent Dimitri Seluk criticised Guardiola.
Stones' second just after the hour wrapped up the victory and left City looking strong already in Group F ahead of back-to-back home games against Shakhtar Donetsk and Napoli.
The first goal came by more robust means, however, as Stones planted a firm header onto a David Silva cross following a short corner. Neat interplay involving Kevin de Bruyne and Bernardo Silva released Kyle Walker and his flawless first-time cross was brilliantly flicked past Jones by Aguero.
One Bernardo Silva error allowed the hosts to break but Michiel Kramer's shot was deflected into the side-netting.
Stones rounded off the scoring early in the second half when he headed in Kevin de Bruyne's cross following another short corner.
Feyenoord starting XI: Jones, St. Juste, Botteghin, van der Heijden, Nelom, Vilhena, El Ahmadi, Boetius, Berghuis, Kramer.