The England goalkeeper says the Potters deserved all three points and has urged his side to improve its performances.
Manchester City goalkeeper Joe Hart says his side's 2-0 defeat to Stoke City is "unacceptable" after Manuel Pellegrini's men suffered their fourth Premier League defeat of the season.
Marko Arnautovic gave the home side a deserved two-goal lead after 15 minutes and England goalkeeper Hart, making his return to action following a hamstring strain, was called upon regularly to help keep the margin of defeat down at the Britannia Stadium on Saturday.
City, again without the injured Vincent Kompany, has struggled without its captain, slipping to defeats to Tottenham, Liverpool and West Ham, but Hart says his absence was not the reason for the defeat.