Following the huge purchases of Zlatan Ibrahimovic and Thiago Silva, Ferguson stated the world had 'gone mad'.
"I find it quite amazing that a club can pay 45 million euros for a 19-year-old boy," said the Scot.
"To tell everyone that PSG are here they've signed Thiago Silva and Zlatan Ibrahimovic. They must have spent about £150m in the last month.
"The only deterrent to that is UEFA.
"In the conditions of European football, you don't qualify for Europe by winning the league or coming second - you only get in by invitation.
"That's where, hopefully, UEFA can have some power.
"When somebody's paying €45m for a 19-year-old boy you have to say the game's gone mad."