He has confirmed that both Cardiff and Birmingham have sat down together to agree a fee.
"Andy Gray and I, Cameron's advisers, sat down with the Birmingham and Cardiff hierarchies and agreed what the price would be," said Finnigan.
"It was very clear, everyone agreed and Birmingham know what they have to do."
"This has been going on for two weeks now but everyone knows what is needed and it is simple really."
Finnigan confirmed there were a host of clubs interested in Jerome and that he is certain to leave Ninian Park this summer.
"Cardiff have to sell, I guess, because they want a new stadium so they have put him up for sale.
"Sheffield United had a £2.4m bid rejected three weeks ago and I know there are a few others interested, West Brom included.
"The thing is, if someone asks you for £3 for something and you offer them £2.80, if you are lucky they might agree to sell.
"Cameron is just a 19-year-old who wants to further his career and better himself and that is the most important thing."