Lionel Messi's biographer says Barcelona's players were "scared" as they were blown away by Liverpool on Tuesday night.

Defending a 3-0 lead, Barca lost 4-0 at Anfield as Liverpool reached a second consecutive Champions League final.

Guillem Balague said on BBC Radio: "Jurgen Klopp understood what happened in the first leg better than Ernesto Valverde. In that game Liverpool had a lot of chances and played a high tempo that Barcelona struggled with. Klopp said they didn't do much wrong in the first leg and they did not have to change much so they did the same again tonight.

"Over the two games, for three quarters of them Barcelona were inferior, scared and unable to find answers. For me, Messi was saying 'how do I influence the game?'. For the last hour where was he? Not many teams have ever done that to him.

"After the first leg, Messi warned the Barcelona players that that game was played at the pace Liverpool wanted, and he said they [Barcelona] were all exhausted and couldn't play at that pace again, but that's what has happened again.

"They fell for a trap. In the wide areas, two or three Liverpool players were always around them. Barcelona tried to look for that extra pass but couldn't find it and lost possession. Barcelona have not played a team like this in a long, long time."