Burnley produced the shock of the League Cup fourth round by knocking Chelsea out on penalties at Stamford Bridge on Wednesday.
The Clarets triumphed 5-4 in the shoot-out when John Obi Mikel saw his sudden death kick saved by goalkeeper Brain Jensen.
The tie had ended 1-1 after 90 minutes after Burnley substitute Ade Akinbiyi had cancelled out Didier Drogba's first-half opener and there was no more scoring in extra time.
Chelsea had promised to take the competition seriously and, although John Terry and Frank Lampard were not included in the starting line-up, only goalkeeper Carlo Cudicini was not a full international.
Burnley, who are hopeful of making the Championship play-offs at the end of the season, should have been behind after just five minutes.
Paulo Ferreira's cross from the right fell perfectly for Deco but the Portugal play-maker headed across goal and wide from just six yards.
Jensen did well to deny Salomon Kalou after Drogba had put him through, with the Dane sticking out an arm to stop the Chelsea man from taking the ball round him.
Juliano Belletti, one of six Chelsea changes from the side that had won 2-0 at Blackburn on Sunday, took a knock and had to be replaced by Lampard in the 27th minute.
And within two minutes the England midfielder had started the move that put Chelsea ahead, although the hard work was all done by Drogba.
He showed great skill to get past one defender to get into the penalty box and, before anyone else could intervene, curled a right-foot effort beyond Jensen to record his first goal of an injury-hit season.
The Ivory Coast international, who was making his first start since suffering a knee injury in the Champions League game in Cluj on October 1, had not scored since his two goals helped Chelsea reach the Champions League final at Liverpool's expense in April.
Another of the recalled players, defender Branislav Ivanovic, came close to doubling the lead in first-half stoppage time but the Serb's near-post header from a Florent Malouda free-kick hit the bar after beating Jensen.
Chelsea replaced Deco with Mikel at the interval and Burnley made a change of their own on the hour mark when Akinbiyi replaced Martin Paterson.
Burnley manager Owen Coyle had not picked the former Leicester forward for two months, but within 10 minutes Akinbiyi had levelled the score straight after Chelsea had swapped Drogba for the inexperienced Franco Di Santo.
Chris Eagles was the architect with a run into space on the left of the box but Cudicini should have done better than to parry the resulting shot into the substitute's path.
Akinbiyi made no mistake right in front of goal despite the presence of defenders and the 6,000 away fans behind the goal celebrated joyously.
Jensen had to make a smart save to keep out a Di Santo header and the newcomer, having been put through by Mikel, then fired wide in stoppage time with all the goal to aim at.
Lampard had a goal disallowed for off-side early in the first portion of extra-time and Chelsea were down to 10 men when Di Santo limped off with all three substitutes already used.
Alex put the ball over from four yards in the second period after Bridge had picked him out but Burnley were reduced to 10 men when Steven Caldwell was shown a second yellow card for obstructing Malouda.
Burnley won the penalty shoot out after Jensen, who had earlier denied Bridge, palmed away Mikel's spot kick for a 5-4 victory.
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