Former AZ Alkmaar striker Kenneth Perez feels Manchester United's players won't be able to handle Louis van Gaal's demands.
Perez played for Van Gaal at AZ.
He told the Mail on Sunday: "My only worry that Van Gaal would not be a success is because English players are not tactical, clever players. At the moment the back-line don't push up, so the space between midfield and the defence is too big so everyone can just play in between there. It's just too easy. It was unbelievable in that first game against Swansea and I doubt they understand what he wants."
