Concert promoter Álvaro Ramos, was told only her and her entourage are allowed backstage passes.
Speaking at a press conference, he said: "We have to take extreme care, like I have never seen for any other artist. We cannot even look at the dressing room, after it is ready, or even open the door.
"We can only enter after her sterilisation team has left the room. There will not be any of Madonna's DNA, any hair, or anything. They will clean up everything. In the end it is all to protect her and make her feel comfortable.
"I do understand it, but it is taken to extremes."
Álvaro added: "Her team will build everything for her, including fake ceilings and fake walls, so they can ensure that no one has hidden a camera somewhere."