"Of course, there was a tremendous outcry in the football family, people called it outrageous and scandalous.
"Is it acceptable to offer such sums of money for a single player? Many people have responded by talking about limiting players' wages by introducing a European salary cap."
Platini said that clubs such as Real Madrid and Manchester United are not immune to the global economic downturn and regulation must be put into force.
"For the past 15 or 20 years, we have grown tired of hearing that the market regulates itself perfectly, that excesses and imbalances will disappear of their own accord and that the growth of income in football is an endless upward spiral," he said. "We now know none of this is true."
Platini stressed this was "only the beginning of the discussion" and any legislation limiting spending would only come in "on a consensual basis and with a view to strengthening this system".