Evra knows better than to expect an easy time against the Hammers, whose fans take particular pleasure in making the Red Devils squirm.
"At West Ham we have to be ready for the battle, like we were ready against Stoke," he said.
"We know the challenge when you play Sam Allardyce's team. They always knock the ball into the box and put a lot of crosses in.
"That is the Sam Allardyce style. Why would he change it? Not because he is playing against Manchester United.
"We have to defend well and be strong in the air.
"That is what we have done against Stoke, although to be fair, it will maybe be tougher against West Ham."