The Rossoneri won the first leg 3-1.
“We have to do well in these games. They seem easy on paper but the danger lies behind the corners,” said Ancelotti.
“I will not make major changes to the team but we need to be careful because Zurich will play in a different way to how they played in the first leg.
“It will not be easy because they will try hard to overturn the result from the San Siro.”