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The Blaugrana boss believes that those who think that his side are in for an easy ride at Camp Nou are severely underestimating their German opponents' tenacity

Barcelona coach Pep Guardiola is extremely wary of the continued threat posed by Bayer Leverkusen to his side's hopes of reaching the quarter-finals of the Champions League.

The Catalans go into the second leg of their last 16 tie with the Bundesliga outfit in a very comfortable position, having triumphed 3-1 when the sides met in Germany three weeks ago.

However, Guardiola insists that the Blaugrana can ill afford to take their foot off the pedal against a side he credits with an admirable never-say-die attitude.

"Recently we have gone into the second legs of the round of 16 after a draw or a defeat," the Barca boss told reporters on the eve of the second leg at Camp Nou.

"This season we are in a better position than in previous seasons, so I imagine you won't be asking me many questions about the game tomorrow because people think it's done against Leverkusen.

"However, while we dominated Leverkusen in the first half, they were very strong in the second half - and very fast.

"Leverkusen never give up. It looks like they’re dead and suddenly they hit back.

"So, they have their chances of qualifying, of course they do."

Indeed, Guardiola is particularly wary of the threat posed by Leverkusen on the counterattack.

“I hope we have 70% of possession, I really do," the former Spain international insisted. "But what concerns me is their speed.

"We have to control the match and make sure they don't pick up speed."

The game at Camp Nou kicks off at 20:45CET.

Since November, has been publishing exclusive extracts from Graham Hunter's highly-anticipated new book, 'Barca: The Making of the Greatest Team in the World'. The very last extract, which was published last Friday, looks at Andres Iniesta's risky return from injury in the 2009 Champions League Final and how he was described by Wayne Rooney as the 'best midfielder in the world'. Don't miss it!