Chelsea midfielder Frank Lampard admits they have 'unfinished business' with Barcelona as they prepare to meet again in the UEFA Champions League.
The Blues set up a semi-final showdown with Barca with a 3-1 aggregate win over Benfica in their quarter-final tie on Wednesday night.
Chelsea still have bad memories of their 2009 Champions League semi-final defeat to Barcelona when Andres Iniesta's last-gasp goal ended their dreams of reaching the final following several controversial refereeing decisions.
Lampard admits that game is still fresh in their memories and although he concedes the Catalan club are favourites he believes the Stamford Bridge side can shock the holders.
"Everyone's got unfinished business with them," said Lampard.
"You have to respect they're the greatest team in the world; they have been and still are at the present time.
"That game is still in our minds, but this is a completely different year so we need to try and beat them.
"Obviously they're going to be favourites because of the way they're playing.
"We have a lot of belief in ourselves here, we know we'll have to perform at out absolute best to get a result against them and we believe we can do that."
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