It wasn't made clear just how much was wanted for last season's top scorer but now Santa Cruz has been speaking to the Portuguese press and it seems the fee is a cool £25 million.
"I thought when they offered £16million it was going to be accepted," he told Futbol a lo Grande.
"It seems the club is worried that they won't be able to find a replacement if I go - that is what is giving them doubts.
"You hear all the time that the club have asked for £20 million and I don't know if City are going to offer that or if they are going to increase their bid.
"For $35-37 million (around £25 million) they [Blackburn] said that I will be allowed to leave."