The coach denied it "all went wrong" for his side in their 4-0 loss to PSG but admitted they were on the back foot from the first whistle
Zlatan Ibrahimovic's double - split up by goals at the very start and end of the game from Blaise Matuidi and Yohan Cabaye respectively - saw les Parisiens put one foot firmly in the Champions League quarter-finals with the first-leg win.
The Bundesliga side need a miracle at Parc des Princes in the second leg, though the Finnish coach denied that his players were entirely to blame for the four-goal thrashing.
"You can't say that it all went wrong. You also have to look at what kind of team we faced," Hyypia told reporters.
"PSG are a top-class opponent and they were excellent. If you fall behind after three minutes it is always difficult to fight back."
Emir Spahic was sent off for Leverkusen on the hour-mark and Hyypia said his team reacted well to the red card, even suggesting they were better off being a man down.
"It became very difficult and we never found our usual rhythm during the first half," the Bundesliga coach added.