Bale has been heavily linked with a return to England with either United or Chelsea at the end of the season.
The Welsh winger has come in for criticism from Real fans for some indifferent form in recent weeks.
Real Madrid buy the best players in the world. They don't sell them.
Gareth Bale
But the Real Madrid assistant boss says Real aren't a selling club and that Bale won't be going anywhere.
He said: "Real Madrid buy the best players in the world. They don't sell them.
"Of course other clubs will be interested in him, he would improve any squad in the world, but the president has said he is not for sale and that is because he is not for sale.
GETTY
Gareth Bale will be staying at Real Madrid
"That will be the answer to Manchester United or any other club that asks the question.
"He was a big part of our success last season especially in the Champions League, and as we look to defend our title I am sure he will play a successful part again."
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