Although Adele was forced to cancel one of her Wembley dates during the summer after damaging her vocal cords, Wynn bosses are not concerned about Adele potentially having to cancel any of her Vegas shows.
The insider explained: "Adele is a professional, and knows her own ability. And we are happy to be flexible in negotiations if it's needed in order to bring her on board."
Meanwhile, Adele revealed during her 'Adele Live' tour in March that she was planning to take an extended break from touring in order to focus on having another baby.
She said at the time: "I'll see ya later, I'll see ya on the other side. In a couple of years when I'll be back, you won't be able to get rid of me. I'm going to go and have a baby."
The 29-year-old singer already has four-year-old son Angelo with her husband Simon Konecki.