Rafael Benitez warned his Chelsea players to sharpen up or risk losing the Club World Cup final after they eased off in Thursday's semi-final win over Monterrey.
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Interim manager Benitez was pleased with his jet-lagged side's 3-1 victory in Yokohama, but pulled them up on the late slackness that saw them fail to keep a clean sheet.
Benitez feared a repeat could cost the European champions dearly in Sunday's final against South American counterparts Corinthians.
He said: "I'm not very happy with the goal we conceded.
"We won, which is fine, but still these little things can make a difference in a final, for example."
He added: "When I talk about a winning mentality, always I talk about little details making the difference.
"The team has to think about winning, winning in style and not conceding because the goalkeeper likes clean sheets.
"They have to keep their concentration right to the end of the 90 minutes. That's what they need to do."
As well as winning the Club World Cup with Inter Milan two years ago, Benitez has bitter experience of losing the final after Liverpool lost a match they dominated against Sao Paulo seven years ago.
Chelsea wasted several first-half opportunities on Thursday, leading only 1-0 through Juan Mata.
"You have to take your chances," said Benitez, who watched his players produce a three-minute second-half blitz to kill the contest through Fernando Torres and a Darvin Chavez own goal before Aldo de Negris' stoppage-time consolation.
Three matches without a win have now been followed by a hat-trick of victories for the man who still could not escape the ire of Chelsea fans, despite being so far from home.
"Now the team knows what we want to do," Benitez said.
"They have more confidence and are enjoying their football a bit."
Chelsea's upturn in fortunes has corresponded precisely with that of Torres, who scored for a third successive match on Thursday for the first time in his Stamford Bridge career.
"He's a bit sharper, has more confidence and the team's playing well," said Benitez, who admitted Torres could have done better with other chances that came his way.
"It's a run, and that's good for him and good for us. Hopefully it will continue.
"If we continue creating chances, he'll carry on scoring.
"We haven't done too much differently. We've analysed his movement and fitness, but it's not been a massive difference.
"He has more confidence so it's easier for him when the team creates a chance to score.
"And the team is creating more chances, which means he'll have more opportunities to score."
Benitez stuck to his vow to field a strong team against opponents predicted to offer little resistance, his only selection surprise seeing defender David Luiz start in midfield for the first time.
"It's an option for the future, but it was mainly for this game," Benitez said.
"I know David from Benfica, where he was playing centre-back, left full-back, right full-back, in many positions.
"David is quick and can regain a lot of balls and, at the same time, can play passes to our players."
Benitez was taking nothing for granted ahead of a final Chelsea will also be expected to win.
"You can never be confident when you play a final, because anything can happen," he said.
"We have a good team and some experience too, but we need to win against any team.
"Corinthians will be tough, difficult, and Brazilian teams are good teams.
"We are ready and can do it, but we need to play the game."
He added: "I don't like to talk too much about what it means to win."
Monterrey boss Victor Vucetich was philosophical about his side's defeat.
"Well, we lost and we regret that we lost the way we did," he said. "We did our best. However, there were several times when we lost our concentration.
"We knew we had to play the perfect match, but we couldn't. That's why we conceded so many goals."
And in what could be a warning to Corinthians, Vucetich said: "European level is the best level, the top level, in the world.
"The players are getting paid a lot, so that's how they get great players."