Former Spain international Gaizka Mendieta believes that Chelsea will fail in their attempts to stop Lionel Messi when the two sides meet on Wednesday.
Chelsea are hoping to go through against the odds at the Nou Camp, following a 1-1 draw in the reverse fixture at Stamford Bridge.
Messi got Barcelona's only goal in that game.
"You cannot stop Messi," he told Goal.
"You can stop Barcelona but (Lionel) Messi is difficult. If you try to stop (Lionel) Messi, then you have (Andres) Iniesta.
"Then, you also have (Luis) Suarez, there is so much individual talent in the team."