Cesc Fabregas has warned his Barcelona team-mates against complacency when they face Real Madrid in the second leg of the Copa del Rey semi-final on Tuesday.
The first leg finished 1-1 in Madrid and Barca’s dominance of all things domestic this season makes them favourite to advance on home soil.
But Fabregas reckons his side have already missed one chance to deliver a killer blow to Jose Mourinho’s side and they cannot afford to do so again.
"We had our chances to make it 2-0 in Madrid," he told Barcelona’s website.
"In the return leg we will need to be as effective as possible, because they are very effective. We have to be on target in front of goal if we want to get to the final.
"It’s vital to score, we cannot go into the match and wait to see what happens. In last year’s Cup Clasico return leg – we had a good result from the away leg – and we were nearly eliminated from the competition.
"Madrid are very dangerous and in order to go through we’ll have to play the best football we’re capable of."
Barcelona are chasing a treble with the Primera Division title all but sewn up, although their Champions League hopes are dangling by a thread after a surprise 2-0 loss away to AC Milan in the first leg of their tie.
For Madrid, the cups have even more currency as their only hopes of silverware in a season where they have fallen drastically short of expected standards in the league.
Mourinho’s side trail Barca by 16 points in the league but can salvage some pride with cup success.
Defender Pepe, who will be looking to cap his 30th birthday on a positive note Tuesday, is upbeat about their chances.
"If we play as a team we have a good chance of winning the play-off," he told the club’s website.
"We have to remain true to our style of play and do what coach Mourinho asks and we’ll have a good chance of winning the play-off."
With all the attention a Clasico fixture attracts, it would be easy to forget it is one of two semi-final second legs this week with Atletico Madrid and Sevilla ready to settle their tie, in which Atletico will head south with a 2-1 lead.