Manchester United boss Louis van Gaal expects an aerial bombardment from FA Cup opponents Cambridge United tonight.
The Dutchman has studied his Sky Bet League 2 opponents in great detail and is expecting them to try to use their height to cause a huge shock on Friday night.
"Cambridge play very direct, with long balls. They have five or six players above 1m 90cm (6ft 3in) so for us it's difficult to defend and that's why you have to prepare yourself very good," the United manager said.
"It's not so easy to beat Cambridge United."
If he needed reminding about how easy an upset can happen, he received it from his homeland this week.
"On Wednesday PSV Eindhoven, who are top of the first league in the Netherlands has lost against the third team of the second division (Roda JC)," the 63-year-old said.
"Ajax, Feyenoord and PSV are out. That's remarkable.
"Surprises shall happen also in the FA Cup. There are always surprises and I hope we are not the surprise.
"It's always tough to play against teams that, in the mind of the players, are weaker.
"In our minds you are believing that we are playing against a weaker opponent but that's not like that.
"It's another opponent with another playing style with other players and we have to beat them."
