Kaka joined AC Milan from Brazilian side Sao Paulo in 2003
A leading football finance expert has suggested Manchester City's proposed �108m move for Kaka could be potentially dangerous for the club.
"What we do know is from history that you can build a team with this kind of money," said Keith Harris, who brokered Roman Abramovich's purchase of Chelsea.
"Blackburn did it in the mid 1990s. They did it once and were soon relegated," he told BBC Sportsworld.
"It's difficult to imagine this will be a successful team-building exercise."
What they chairman and managers will be fearing now is the wage inflation
Keith Harris
The current record for a player's signature is �46m when France's Zinedine Zidane moved from Juventus to Real Madrid in 2001.
And Harris questioned whether City's move for Kaka was good for football, particularly during an economic downturn.
"It's not easy to see how it can be," said Harris, the chairman of investment bank Seymour Pierce.
"In a world where football chairmen and finance directors are tightening their budgets ahead of a year of great uncertainty, here is a group that is prepared to splash out this type of money.
"The transfer market for players is cut-throat and we should be entering a period of restraint.
"We should be seeing a trend of worldwide restraint in the wake of some serious problems and this is not what we are seeing here by any measure."
Harris expressed further concerns that fee being discussed for Kaka could have serious repercussions for the transfer market.
"You can readily understand the reaction from other football club chairmen and managers," said Harris.
"Some of it will be out of fear, some will be a little bit of envy but first and foremost, notwithstanding competition, there had been an acceptable level of valuation for players.
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