Barcelona supervisor Luis Enrique acknowledged the fault for the substantial thrashing at Paris St-Germain, which leaves the Spanish mammoths in peril of neglecting to achieve the Champions League quarter-finals.
Angel di Maria scored twice as PSG won the last-16 first leg tie at the Parc des Princes 4-0 on Tuesday.
No side in the history of the competition has come back to win from such a deficit.
“It was a disastrous night for us; we were clearly inferior,” Enrique said.
“I’m responsible for this.”