If Chelsea were prepared to sell - and Mourinho stressed they are not - a world record fee would be required.
Mourinho said: "I am not worried because if his value was around £40million when Chelsea bought him, if two years later he is twice or three times better than he was when we bought him, I think his value in the market is a crazy value.
"On top of that, he's not a player Chelsea are interested in selling anyway.
"Between our tag of 'not to sell', plus the crazy amount that he can be valued at in this moment, I think there's no chance that Eden is going to leave."
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