Manchester City chief Ferran Soriano sees changing a manager every three years as good for the club.
Soriano sacked Roberto Mancini before the end of last season.
"I donâ€™t know how Chelsea operates, thatâ€™s their problem. But our behaviour and our approach to management has, I think, been appropriate.
"Three years in football is a long time. In football, teams have cycles and you can have managers who go through several cycles and managers who go through one cycle. Obviously, we want the next manager to stay for a number of years, but I think it would not be wise to speculate.
"Maybe a manager can do one or two cycles, but people get tired. Players need another way, another excitement, and managers also want to move. Itâ€™s normal."