Manchester City playmaker Kevin de Bruyne doesn't think Pep Guardiola's side can maintain their unbeaten record until the end of the season.
The Sky Blues have been dominant in the Premier League this campaign, winning 10 and drawing one of their 11 fixtures thus far, but De Bruyne believes it's unrealistic to expect an unbeaten season.
The Belgian told Sky Sports News: "I don't think that will be possible because I think you have so many games and too many important games.
"The power of the Premier League means every team has a lot of money and every team has a lot of quality players, so I think one day or another you will face a team who find a system to beat you, or they have a better day."
City have already opened up an eight-point lead over second-placed Manchester United, and have scored 38 goals while conceding only seven.