Chelsea chief executive Peter Kenyon has branded Arsenal and Manchester United "hypocrites" after their criticism of the Premiership champions.
Kenyon has come out fighting against Premiership rivals
The Blues have been criticised by their rivals after being found guilty of "tapping up" Arsenal's Ashley Cole.
But Kenyon said: "It is born out of hypocrisy and fundamental insecurity.
"There have been two kids on the block for 12 years. Now there is suddenly a third kid threatening to be more successful. They don't like it."
He added: "That is what this nonsense is about. They are trying to blow us off course, they are trying to blow us away from our plans and stop us winning.
"Is it disrupting us? Not really, but it is time consuming. But it is not going to stop us from being a successful club. We have to accept it but we don't like it."
Kenyon, currently in the United States on Chelsea's pre-season tour, also spoke out about the Cole 'tapping-up' affair, when both Chelsea and their manager Jose Mourinho were found guilty of making an illegal approach for the England full-back.
Kenyon claimed such incidents "go on every day" and that Chelsea players are regularly the subject of such approaches.
He said: "Some of the instances where Chelsea have been villified go on every day and, guess what, it goes on with Chelsea players too.
"But we have chosen not to complain. But we will not put ourselves in that position again."