Scott Parker set up Eidur Gudjohnsen, who slipped but managed to find the lurking Crespo, who turned and scored from eight yards.
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He can call on Iceland striker Eidur Gudjohnsen and Argentina's Javier Saviola while Lionel Messi, Ludovic Giuly and Ronaldinho provide further options.
Chelsea raced into a three-goal lead in 19 minutes, with Eidur Gudjohnsen, Frank Lampard and Damien Duff on target for Jose Mourinho's side.
With both Jimmy-Floyd Hasselbaink and Eidur Gudjohnsen not enjoying their best seasons last year, much will be expected of the man known as the Romanian bomber.
Ronaldinho, Deco, Samuel Eto'o, Gianluca Zambrotta, Lilian Thuram, Xavi and Eidur Gudjohnsen were also among the players who arrived at the Nou Camp for a 9am start.
Iceland had produced nothing in attack since scoring so it was no surprise to see Barcelona striker Eidur Gudjohnsen enter the fray after 53 minutes with Bjornsson making way.
The news will come as a relief to the Italian after Tottenham persuaded Monaco striker Eidur Gudjohnsen to reject the Hammers in favour of a move to White Hart Lane.
Eidur Gudjohnsen flicked on to free Drogba, who shrugged off Senderos's tackle and against all the odds remained on his feet after Lehmann and Lauren tried to clear the danger.
Eidur Gudjohnsen had two opportunities - one which he guided wide and high and the other blocked by Green - and Zola had a point-blank header saved before Stanic's goal.
Eto'o has been replaced by former Chelsea striker Eidur Gudjohnsen but the Icelandic forward has yet to replicate the understanding the Cameroonian forged with the likes of Ronaldinho, Lionel Messi and Deco.
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Atletico equalized through Sergio Aguero in the 56th minute, but when Eidur Gudjohnsen played in Henry for his 14th of the season to give the visitors a 3-2 advantage it looked all over.
But there was to be no fairytale turnaround for Bolton, and instead Spurs - who were themselves energised by the half-time introduction of the lively Eidur Gudjohnsen - put the gloss on the win with a late fourth.
Tottenham consolidated fourth place with a hard-fought 2-1 victory at 10-man Stoke , as substitute Eidur Gudjohnsen came off the bench to put the London club ahead before Dean Whitehead was sent off and then helped set up Niko Kranjcar's 77th-minute winner.
With the minutes ticking down and the hosts increasingly desperate to put the game to bed, substitute Peter Crouch saw a header cleared off the line and then his shot saved after a fine solo run, while former Bolton player Eidur Gudjohnsen slid wide with the goal gaping in injury time.
Former Chelsea and Barcelona forward Eidur Gudjohnsen is yet to start a match since joining Stoke in August, while Tuncay posted a video of some of his favourite goals on social networking site Facebook, which some media outlets believe was an attempt to secure a move elsewhere after growing frustrated with his lack of opportunities at the club.
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