PSG host United defending a 2-0 lead from the first-leg of their Champions League round 16 tie.
But Kurzawa is wary of United's attacking threat and says: "We started preparing at the end of the first leg, even if we had championship games that we focus on first.
"In a corner of the mind we have Manchester because if we win we will reach a new level.
"We will have to be ready because they will be, we already had similar meetings in front of our supporters. We will have to win by playing well with the ball."