Chelsea stun Barcelona in Champions League April 18, 2012 -- Updated 2135 GMT (0535 HKT) Chelsea's Didier Drogba scores with the last kick of the first half against Barcelona Chelsea stun Barca 1-0 in the Champions League semifinal first leg Didier Drogba scored the game's only goal Dream of a Real Madrid-Barca final fading Return leg is in Spain in six days time (CNN) -- Chelsea stunned European champions Barcelona with a 1-0 victory in the semifinal first leg of the UEFA Champions League on Wednesday night. Ivorian international Didier Drogba scored the only goal of the game late in first half injury time at a rain-swept Stamford Bridge in west London thanks to a rare mistake by Barcelona's Lionel Messi. After watching Spanish league leaders Real Madrid lose to Bayern Munich the night before, Barcelona was hoping to avoid any slip ups as they attempted to defend their title. And the game appeared to be going their way as they dominated possession with Messi creating chances whenever he got on the ball. But Barcelona was profligate in front of goal with Cesc Fabregas particularly guilty, the Spain international missing a hat-trick of clear-cut chances. As half time approached Chelsea grew in confidence having weathered the initial storm and took a shock lead with the very last kick of the first half. Messi's rare lapse in concentration saw Brazilian midfielder Ramires career down the left wing. We respect them. But we're not in awe of them Didier Drogba With few options in front of him Ramires fired a low ball across the penalty box which eluded Barcelona's defense before somehow finding Drogba lurking at the back post. Barcelona goalkeeper Victor Valdes could do little but palm his first time shot into the back of the net. Despite Barcelona experiencing the rare feeling of being behind at half time, it was Chelsea that grew more comfortable as the game progressed, snuffing out the Catalan club's attacks with increasing confidence. Yet deep in injury time Barcelona could have leveled the tie and score a crucial away goal. But substitute Pedro hit the post with his low curling shot giving Chelsea -- who were controversially knocked out of the competition by a late Barcelona goal in 2009 on the same ground -- a famous victory. It was a great result. When you play Barcelona you have to do a lot of defending, just try and limit their threat and be clinical with your chances," Chelsea's interim coach Roberto Di Matteo told British network ITV. And clinical they were. Drogba's goal turned out to be Chelsea's only shot on target in a game where Barcelona enjoyed the majority of possession: Chelsea completed 194 passes whilst Barcelona managed 782, almost four times as many. Yet the one statistic that counts is the score and for those that played in the last Chelsea-Barcelona Champions League semifinal in 2009 -- where Chelsea had five clear penalty claims turned down before an injury time Andres Iniesta goal clinched their place in the final -- the victory was sweet revenge. I think we've learned, we've improved from three years ago. Now we're going to go there [the Nou Camp], have a go and try to qualify [for the final]," said goal scorer Didier Drogba. Now attention turns to the second leg at Barcelona's Nou Camp. "It's going to be tough there," admitted Drogba. They will have opportunities. But we're not in awe of them.