Ballack said: "We saw the Manchester United game and I am sure they watched our match on TV.
"We proved we are a very strong team. We have a good shape and look good. Now we will see what happens on Sunday."
Ballack expects Wigan to test United to the full even though they are managed by former Old Trafford favourite Steve Bruce.
He is convinced they will go about their business in a professional manner.
"We have put pressure on United," said the former Bayern Munich midfielder.
"Now we hope Wigan are proud enough to give everything in the last game."