Sir Alex Ferguson has repeated his warning to big-spending and big-talking Manchester City: "It takes more than money to build a successful team."
Just three days after crushing Portsmouth 6-0 in the Premier League, City were dumped out of the Carling Cup by League One Brighton.
And Manchester United boss Ferguson had a warning for his big-spending rivals saying: "It's all very well having all the money but you can't buy everyone. It was proved in the summer.
"We didn't want to sell Ronaldo, other clubs don't want to sell their best players, and there are only so many players you can buy."
The Old Trafford boss told the club's official magazine, Inside United: "Back in the 1950's Sunderland were called 'The Bank of England Team' - and they got relegated. There are no guarantees.
"You can buy 11 individuals - you can buy 11 Robinhos but it wouldn't be a team would it?
"The art of management is building a team with balance, with certain characteristics that blend with each other - that's the most important thing."
City manager Mark Hughes, who played under Ferguson at Old Trafford, has been promised time to achieve success by City's hugely wealthy new owners from Abu Dhabi but Ferguson remains sceptical about his former charge's chances of survival.
But Ferguson added: "Mark Hughes will be faced with that situation having all this money and wondering what to do with it, and that can put you under a bit of additional pressure."