The defender admits the Bavarians were the deserved winners following his side's 4-0 thrashing at the Allianz Arena that leaves its European hopes hanging by a thread
Two goals from Thomas Muller, coupled with second-half strikes from Mario Gomez and Arjen Robben have ensured that Tito Vilanova's side will need to put in a brilliant performance in the second leg at Camp Nou next Wednesday to reach the final.
"They were quicker, stronger and played better football," Pique told TV3. "They were the superior team. [Wining the tie] is almost impossible. We will have to turn around and go out and win the next match for our fans.
"We have been given a refresher."
Gomez's tap-in - which put Bayern 2-0 up - appeared to be offside while Muller fouled Jordi Alba for Robben's goal but the former Manchester United center back did not want to lay the blame on officials.
Pique insisted: "The referee did not have any influence on the result."