Salomon Kalou believes 'anything is possible' as Chelsea ready themselves for a UEFA Champions League semi-final showdown against Barcelona.
A 2-1 victory over Benfica on Wednesday saw the Blues book their safe passage into the last four, with Portuguese opposition disposed of 3-1 on aggregate.
Barca now lie in wait, with the reigning European champions having blazed a trail through this season's competition.
They are considered to be the team to beat, but Chelsea are in optimistic mood heading into a two-legged tie against a side they have seen plenty of in recent years.
"For most people Barcelona are the best team in the world, but in two matches anything is possible," said Kalou.
"I believe that in a Champions League match you can never underestimate an opponent.
"We saw Inter (Milan) with (Jose) Mourinho cause Barca trouble two years ago. We also played great matches against them three years ago.
"We know Barcelona well, but we must forget about the past."
Petr Cech is also looking forward to locking horns with Pep Guardiola's Catalan heavyweights and believes Chelsea are fully deserving of their place in the last four after digging deep to see off Benfica.
"We had so many opportunities, I really thought we would score three goals," the Blues keeper told Canal+.
"Benfica played very well and deserved to score one goal. We were under pressure until the end of the match.
"(Pablo) Aimar put in a great performance, he was intelligent and led his team in midfield.
"We are happy to have qualified and playing Barcelona will be a great challenge."
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