Former Liverpool manager Gerard Houllier believes Barcelona were "scared" by the Anfield atmosphere and the performance it inspired in the Reds on Tuesday.
Liverpool overturned a 3-0 first-leg deficit to dump the champions of La Liga out of the Champions League 4-3 on aggregate at the semi-final stage.
Divock Origi scored early and a raucous Kop roared Jurgen Klopp's men home after Georginio Wijnaldum's second-half double, with the Belgium striker also getting his second to settle the tie.
Houllier, who led Liverpool to UEFA Cup glory in 2000-01, beating the Catalan giants in the last four, claims he always backed the hosts to upset the odds and felt the stage got to Barca.