The Bavarians found themselves overpowered by a free-flowing PSG side at Parc des Princes this week as Dani Alves, Edinson Cavani and Neymar all got on the scoresheet to send them three points clear atop Group B.
And, speaking after the game, Rummenigge said: "I think it’s a really tough defeat. What we saw tonight was not the real Bayern.”
Bayern veteran Thomas Muller echoed his chairman’s sentiments, saying: "We had a lot of space but were not effective enough in using the openings. 18 corners to one clearly shows we tried hard."
Midfield maestro Arjen Robben added: "Conceding a goal after just one minute is the worst possible scenario. That makes you play into their hands.
”We put in loads of crosses and corners in the first half and the second but we couldn't hit the target."