Neymar is wanted by both European heavyweights, with negotiations underway today.
"Real Madrid should do whatever it takes to sign Neymar. He's a great player and I feel like he's ready to make the move to Europe. He needs to leave Brazil to fulfil his huge potential," Roberto Carlos told Marca.
"If Madrid don't sign Neymar, Anzhi could make a move for him. My Russian team has plenty of money to spend."