The Blues are already through to the last 16 of the Champions League with two games left to play, but three points at Porto will see them win their group.
“Porto have a very good team and coach but while we respect them we have no fear,” said Ancelotti.
“I think tomorrow is important not only for first place, but we will play against a strong team. They did well in the last game at Stamford Bridge (a 1-0 win for the Blues). We want to put our personality and quality on the pitch tomorrow night.
“We want to arrive at first place in the group and it is a very good test because Porto are a very good team.
“We have the possibility to win if we play better than them. I don’t know any other way.”