Alex Ferguson has accused the English FA of not thinking about the cost being heaped on fans attending next month's FA Cup semi-finals.
Manchester United will tackle Manchester City at Wembley on April 16, 24 hours before Bolton take on Stoke.
All four teams face a very similar journey, on the same weekend Arsenal entertain Liverpool and the annual London Marathon attracts visitors from all over the world.
"It's going to be absolute chaos," said Ferguson.
"I don't think the cost of people travelling down to Wembley is considered.
"There will be 60,000 people coming down from Manchester -- think about how much petrol is used for that?"
United could emulate the heroes of 1999 by claiming the Treble.
However, Ferguson, whose side must overcome Chelsea in the Champions League quarter-finals, in addition to their attempt to retain the Premier League leadership, feels the task is far harder than it was back then.
"It is going to be more difficult than it was in 1999," he said. "There is a great desire to do it but we have so many injuries to defenders at present.
"We will never give in though. No matter what happens, you always feel Manchester United will score in the last minute.
"We must have a chance but it is more difficult than it has ever been."
United have a five-point lead over Arsenal in the title race, but Ferguson is taking nothing for granted.
"It looks as if it's going to be us and Arsenal, but you never know," he said.
"Manchester City, Chelsea and Tottenham are still in the frame. You can't dismiss them."