(Goal.com) - Frank Rijkaard was a member of the AC Milan side which was the last to retain the European Cup - in 1990 - but the Barcelona manager admits that his reigning European champions are in danger of not reaching the knock-out phase of this season's tournament, never mind retaining the trophy.
Barca have five points from their four games in Group A, and are out of the qualifying places following their 2-2 home draw with Chelsea.
The added-time equaliser by Didier Drogba snatched two precious points away from Barca and leaves the Catalans in third place behind Chelsea and Werder Bremen.
Rijkaard acknowledged Barca's predicament when he said: "There's no margin for error now. We have to beat both teams and win our last two games. We just have to do it."
Regarding the Chelsea game, he said: "We played a good match and showed a good attitude and the public recognised that.
"Chelsea played very well and created chances. They are a strong team. They play very hard.''
Barca can still qualify for the last 16 of the Champions League, as long as they win their final two group games, away to Levski Sofia and at home to Werder Bremen - but they have obviously made life difficult for themselves by gleaning a solitary point from the six that were up for grabs in their two clashes with Premiership champions Chelsea.
It was a compelling spectacle at Cam Nou last night, a pulsating match with its inevitable sprinkling of controversies; and of course Barcelona came within a hair'ss breadth of winning it 2-1. But Chelsea's resilience and dogged spirit earned them an equaliser and despite the good football they played, Barca are left with a hill to climb.
The outcome offered more ammunition to those who claim that Barcelona have gone off the boil since last season.
After winning two successive Spanish titles and the European Cup, Rijkaard's side are again setting the pace in the Primera Liga, albeit with a bit less dash and exuberance than they showed last Autumn.
But the defeat by Chelsea in London two weeks ago, and the recent loss (always regarded as a humiliation in Catalonia) against Real Madrid have sown doubts about Barca's durability.
Expectations are so high at Camp Nou, where the motto is "Mes que un club" - more than a club - that such results, and last night's home draw, are hard for the fans to take.
As Raddy Antic, a former Barca coach, told BBC Sport: "For Barcelona fans it's never enough just to win. The club has to win with style. It is the same with Real Madrid. Their coach Fabio Capello is being criticised for Real's style of play, even though they are only two points behind Barcelona. That is the pressure these coaches work under."
Now Barca face a tough challenge to reach the knockout stages of the Champions League, and Rijkaard is likely to be criticised for persisting with his rotation policy.
The two title-winning seasons of 2004-05 and 2005-06 saw Rijkaard stick with a fairly settled starting XI, but this season he has been regularly ringing the changes, and inevitably some players struggle to come to terms with being "rotated."
"Giovanni van Bronckhorst played in the [first] game against Chelsea but was not even included in the squad against Real Madrid," Antic pointed out, adding: "That type of decision makes it difficult for van Bronckhorst but also for the other players - they think that might happen to them."
Then there is the loss of Samuel Eto'o. All sides have to cope with losing key players through injury, but Ronaldinho's game in particular seems to have suffered from the absence of the Cameroonian striker.
Henrik Larsson has also been missed, particularly as an impact player able to come off the substitutes' bench to influence the course of a match, and Rijkaard has been criticised for playing Lionel Messi on the wide right of midfield rather than closer to goal.
Moreover, the Dutch coach is without the assistance of the tactically perceptive and popular Henk ten Cate this season, following his appointment as Ajax coach in the summer. So some are seeing Rijkaard's task this year as a tougher one than last year's.
And in terms of retaining the European crown, history is also against him.
Barcelona's victory in the Champions League final against Arsenal last May was the club's second triumph in Europe's premier competition. The first was in 1992 when Barca beat Sampdoria in the last season before the format of the competition changed to the Champions League.
Two years before that, Rijkaard was in the AC Milan side that beat Benfica 1-0 to retain the trophy they'd won 12 months earlier by defeating Steaua Bucharest 4-0.
That victory put Milan in a select group of eight clubs who've won the competition in successive seasons - though no club has retained the trophy during the Champions League era.
Barca's arch-rivals Real Madrid set the bench-mark by winning the European Cup in each of the first five years of its existence (1955-56 to 1959-60 inclusive). Ajax (1970-71 to 1972-73) and Bayern Munich (1973-74 to 1975-76) both won the tournament three years on the trot.
And Benfica (1960-61 and 1961-62), Internazionale (1963-64 and 1964-65), Liverpool (1976-77 and 1977-78) and Nottingham Forest (1978-79 and 1979-80) were all European champions two years running.
Remarkably, for a decade (1971 until 1980) four clubs took it in turns to win and retain the European Cup, but no club has managed that feat since - apart from Milan in 1988-89 and 1989-90.
And it looks at the moment as if Barcelona will struggle to change that statistic.
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