Former Liverpool boss Gerard Houllier says he always knew they would stun Barcelona this week.
The Frenchman steered the club to UEFA Cup success in 2001 as part of a cup treble that season.
He told talkSPORT: “I don't know why but I had a feeling they could go through, even after the game in Barcelona.
“They were very unlucky at the Nou Camp and there is something special about this team and I had a strange feeling that they would go through.
“This club is something special with the fans. It's not violent, it's not aggressive but it's very loud and it brings the players to attack.
“Once they scored the first goal I knew they would go through.
“They looked practically irresistible and also it makes the opponents scared.
“For the last goal, Barcelona were absolutely frozen!"