The Red Devils go into the game needing just seven more points to win a record 20th championship and have beaten West Ham in their last eight league encounters.
However, Evra has said that his side will take nothing for granted.
"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."
Manchester United beat Stoke City 2-0 on Sunday, courtesy of goals from Michael Carrick and Robin van Persie.