The Sun says with Sven Goran Eriksson and Alex Ferguson fighting over him, City owner Thaksin Shinawatra has told the kid's advisors: "We'll pay whatever it takes."
Chrisantus has no club contract but is owned by a Nigerian agent.
His advisor, Chris Nathaniel of NVA management, said: "Macauley is very special.
"Just about every top club in Europe has inquired about him. But it's about taking him to the right club to develop not the biggest offer."