Sir Alex Ferguson is banned from Old Trafford

The order comes from his son, and Peterborough manager, Darren Ferguson - who claims his father is a jinx.

Ferguson senior watched their semi-final first-leg defeat at MK Dons but steered clear when they won the second leg 2-0 to go through 4-3 on aggregate.

And the Posh are taking no chances as they bid to secure promotion back to the Championship.

"Our chairman is the same, he's told his dad to stay away as well," Ferguson junior said. "We think they are both jinxes. There's a bigger picture, he can watch it on the television."

With the Red Devils squad in London for Champions League final against Barcelona, Posh have been able to make use of their plush training facilities and get accustomed to Old Trafford.

Ferguson junior will be on familiar territory having begun his playing career with United and he hopes his squad will be inspired by their surroundings, as well as by watching the big Wembley showdown first.

"It's been key to be able to train at Carrington and to have a walk around Old Trafford," he added. "Old Trafford is a fantastic theatre - it is called the Theatre of Dreams - and it's a magnificent stadium."

"The players know if we can perform we will be hard to beat."

Posh face a Huddersfield side on a 28-game unbeaten run but Ferguson feels his team are peaking at the right time. "Huddersfield have a bit more experience than us but we'll go into it like we do any other game," he said.

Sir Alex Ferguson is banned from Old Trafford - by his son