Frei believes they can beat Bayern at the Allianz Arena and manage to qualify for the next stage of the Champions League.
“We believe we have a chance to win here, especially us forwards,” the 31-year-old told Uefa.com. “Marco Streller and I have a lot of confidence at the moment.
“We won’t get many chances, so we have to be very alert and take the ones we get. We are in good shape; we did well in our last few games and there is no pressure on us. That could be to our advantage.”