Barcelona v Man Utd
Barcelona striker Thierry Henry was unable to take part in training on Monday morning because of illness.
The France international, who was an unused substitute in Saturday's goalless league draw against Espanyol, was suffering from a fever.
Ronaldinho, Lilian Thuram, Jose Edmilson and back-up goalkeeper Albert Jorquera also missed training.Man Utd team news to follow later.BIG MATCH STATS
Head-to-headsFC Barcelona and Manchester United have met seven times in a European club competition. Both clubs have won twice and three matches were drawn. The goal difference is 15-13 in favour of the Spaniards.
One of these encounters was the final of the 1991 Cup Winners Cup, played in Rotterdam and won by United (2-1).
The last two meetings were in the 1998-99 season, when both matches in the Champions League ended in spectacular 3-3 draws. Four players from the current Manchester United squad featured in those matches: Gary Neville, Ryan Giggs, Paul Scholes and Wes Brown; Barcelona's only survivor is Xavi.
European historyBarcelona have won the Champions Cup/ Champions League twice, in 1992 and 2006. They have also amassed four Cup Winners' Cups, three Fairs Cups and two European Super Cups.
This is the 23rd season in which Barcelona has reached the semi-finals of a European club competition. They progressed 14 times and were knocked out eight times. It is the ninth time they have reached the last four in the Champions Cup/Champions League, not including the semi-final group stage in 1991-92. They went on to reach the final four times and were eliminated four times.
Manchester United have won three European trophies - the 1967-68 Champions Cup, 1990-91 Cup Winners' Cup and 1998-99 Champions League. The final for the most recent of those was staged in Barcelona's Camp Nou Stadum, when Bayern Munich were defeated 2-1.
This is the 13th time that United have reached the semi-finals of a European club competition. They were knocked out nine times, but went on to win the trophy all three times they progressed. It is also the 10th time the Red Devils have qualified for the last four of the Champions Cup/Champions League. They went on to reach the final twice and were eliminated on the other seven occasions.
Last season, Barcelona reached the last 16 of the CL and were eliminated by Liverpool; United got to this semi-finals and were knocked out by eventually winners AC Milan.
Current European formBarcelona and Manchester United are both unbeaten this Champions League season.
Barce have won five on the spin in this competition, and are unbeaten in 11 since the 1-2 home defeat by Liverpool on 21 February 2007. They have also won their last five home matches in the Champions League, and kept clean sheets in each of the last three at the Camp Nou.
United are undefeated in 10 CL matches, since losing 3-0 at AC Milan in last May's semi-final second leg. They have won their last three home and away, and have not conceded a single goal in those games.
Player and disciplinary infoCarles Puyol (Barcelona) is suspended for this match. Lionel Messi, Yaya Toure, Rafael Marquez and Gabriel Milito are all one yellow card away from suspension. Manchester United's Nani and Patrice Evra will also be suspended upon receiving a yellow card.
Puyol and Xavi have played 74 Champions League matches for Barcelona, a club record.
If selected, Gary Neville and Paul Scholes will both make their 100th appearances in the Champions League; Neville made his CL debut in a 3-1 defeat at IFK Gothenburg on 23 November 1994, Scholes' first taste of CL action was in the home 2-2 draw with Barcelona on 19 October 1994.
Cristiano Ronaldo is this season's CL top scorer with seven goals.
http://news.bbc.co.uk/sport2/hi/football/europe/7356114.stm