FC Barcelona's Samuel Eto'o - AP

LONDON (AP):

FC BARCELONA already got one bit of luck in the last week and another could put them on the verge of a place in the Champions League quarter-finals.

Barca are at Celtic today in the first leg of the second round, just four days after the award of a dubious, late penalty kick helped them to a 2-1 win at Zaragoza that reignited the Spanish title race.

Similar fortune at Parkhead could lead to a crucial away goal and even victory over the Scottish champions, who won all their home group games over the last two seasons, but lost all of those away.

And Barca's chances look good since they could field Samuel Eto'o, Thierry Henry, Lionel Messi and Ronaldinho together after injuries and international commitments prevented the quartet from playing together so far this season.

"Things are looking good," Barcelona captain Carles Puyol said. "Now we have to keep going and think about Wednesday when we have a really important match."

Midfielder Iniesta

Barcelona can also call on midfielder Andres Iniesta, who was rested from the win over Zaragoza, which lifted Barca to within five points of Spanish league leaders Real Madrid after the defending champions were upset 2-1 by Real Betis.

The Catalan side may need all its leading players, since eventual champions AC Milan could only draw 0-0 at Celtic at the same stage last season, and needed an injury-time goal in the second leg to advance 1-0.

Celtic warmed up with a 3-0 win over Hearts last Saturday, their eighth straight victory in the Scottish Premier League.

Seven-time European champions Milan continue their title defence at Arsenal, who are determined to bounce back from Saturday's 4-0 defeat at Manchester United in the FA Cup.

"The targets are so big for us that you don't feel sorry for yourself," Arsenal manager Arsene Wenger said. "We have a massive game in front of us on Wednesday night and I feel the immensity of the game makes you forget your disappointment."

And Arsenal have had to get used to disappointment in Europe's premier club competition: they lost the 2006 final to Barcelona and went out to PSV Eindhoven at this stage last season.

Jens Lehmann could continue in goal because Manuel Almunia has a thumb injury, while AC Milan have two goal-keepers struggling with injury.

Zeljko Kalac dislocated a finger on his right hand in training on Sunday and Dida has a back problem, so third-choice Valerio Fiori could start for his first competitive match since December 2003.

Milan captain Paolo Maldini said his team would cope with the injuries.

"We are the defending champions," said Maldini, who made his 1,000th club appearance last Saturday in a 0-0 draw with Siena. "The atmosphere that will await us will surely be fantastic."

Also today, Lyon welcome Manchester United and Fenerbahce host Sevilla.

100 appearances

United could recall the likes of Cristiano Ronaldo, Ryan Giggs and Owen Hargreaves after resting them against Arsenal, with Giggs set to become just the eighth player to make 100 Champions League appearances.

"The likes of Ryan and Paul Scholes - players with great experience - will play," United manager Alex Ferguson said. "They'll be important for us."

Scholes was only a late substitute last Saturday, when Lyon also rested players for a 1-0 loss at Le Mans, which cut Lyon's lead at the top of the French league to one point. It left out Brazil striker Fred and used forward Karim Benzema and midfielder Jeremy Toulalan only as late substitutes, but is sure to recall them.

Fenerbahce and Sevilla will be contesting a Champions League knockout match for the first time, with two-time UEFA Cup champion Sevilla in their debut season.

"Sevilla go to Turkey with only one thing in mind - to win," Sevilla president Jose Maria del Nido said. "In a game of this magnitude, to score early, and often, is the key to victory."

But Fenerbahce beat Inter Milan 1-0 in the group stage and have more experience after four previous seasons in the tournament. Coached by Zico, their squad includes former Real Madrid defender Roberto Carlos, Serbia striker Mateja Kezman and Ghana midfielder Stephen Appiah.