Chelsea boss Guus Hiddink refuses to write off Liverpool, despite his side's shock 3-1 success in the first leg of their Champions League quarter-final.
The Blues are at home in the return leg but Hiddink said: "In the next game we have to be very concentrated.
"We can't take it lightly because Liverpool have proven in the past that they can surprise."
Chelsea captain John Terry will miss Tuesday's second leg through suspension after he was booked on Wednesday night.
"John is not there but we have good players to come in," added Hiddink.
We could have scored more - Lampard
Fernando Torres put the Reds ahead after only six minutes at Anfield but Branislav Ivanovic put Chelsea in front with two headers before Didier Drogba scored a third to put the Blues in control of the tie.
Hiddink conceded he was not expecting his team to win so convincingly at Anfield.
"I admit it was an unexpected result but we are very happy with the win and it was well deserved," he enthused.
"Once we had got the equaliser we did not sit back and be content with the draw. We felt we could score more - and that is what we did.
"We pinpointed areas where we could hurt them. The team could smell that and they took advantage.
"We talked about that situation again at the break and made sure we continued in the same way."
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