CHAMPIONS LEAGUE LIVE: Bayern Munich v Barcelona – as it happens from the Allianz Arena
25min: GOAL! BAYERN MUNICH 1-0 Barcelona
It's been coming and finally the German side's pressure pays off. A corner eventually finds Dante inside the area and his headed effort back across goal is powerfully nodded home by Thomas Muller.
22min: Bayern are slightly fortunate to win a corner as Jordi Alba was adjudged to have failed in keeping the ball in play, but Robben's set-piece is punched clear by Valdes before the visitors win a free-kick for an infringement inside the box.
19min: The home side continue to look dangerous as they go forward but whether it's by handball or other means, the Barcelona back-four isn't struggling too much to cope with the German side. Going forward though it's a different story as Lionel Messi and Co have yet to get into the game.
Clash of the titans: Barcelona's Lionel Messi and Bayern Munich's Franck Ribery fight for the ball
16min: A strong penalty claim from Bayern Munich, as Philipp Lahm's shot is clearly blocked from a raised Pique arm. It's very subtle from the defender but he is very fortunate to get away with that.
14min: From InfostradaLive:
Bayern have never lost a CL semifinal match at home (5W – 1D). Their only draw was in April 1995: 0-0 against Ajax.
11min: A very even opening to a game which neither side has yet to take control of. Barcelona's passing looks better at this stage but it's Valdes who has had to make the only save of the match so far.
Aiming low: Bayern Munich's Arjen Robben sees a shot saved by Barcelona's Victor Valdes
8min: In fact one or two players are slipping on other areas of the watered pitch as Barcelona win their first corner, which is headed wide by Gerard Pique.
5min: The home side have settled now but we have the bizarre case of a waterlogged pitch.
There's been no rain in Munich today but the centre-circle is holding standing water from what is most likely from the sprinklers that watered the pitch before the game.
2min: It takes nearly 80 seconds for Bayern to touch the ball but they carve out the first opportunity. Arjen Robben's through pass feeds in Javi Martinez, and after the forward returns the favour with a cut-back, the winger's low shot is well blocked by Victor Valdes.
Ready to go: The players arrive on the pitch at the Allianz Arena
Kick-off: Away we go at the Allianz Arena as Barcelona possession is immediately jeered by the home crowd.
19.41: Both sets of teams are on the field, as the home fans raise red and white cards to represent Bayern Munich's colours.
19.36: From InfostradaLive:
Bayern are the first German team to play two consecutive Champions League semifinals since 1998/1999, 1999/2000 and 2000/2001, when they themselves achieved this feat.
Preparing: Bayern keeper Manuel Neuer saves a shot warming up
19.31: Viktor Kassai is in charge of tonight's game – with the Hungarian a lucky charm of some sort for Barcelona.
He oversaw their 4-0 win over AC Milan at the Nou Camp earlier this year and was also in charge of the 2011 Champions League final at Wembley where the Spanish side defeated Manchester United 3-1.
Bayern Munich last had the official in their 2-1 defeat at Real Madrid in last year's semi-final.
19.26: They may be stars everyone wants to see but Barcelona were greeted by jeers from the home fans as they took to the pitch for their warm-up.
19.23: Whatever you think of this current Bayern Munich team there is no denying how impressive their current form is. They have won 19 of their last 20 matches in all competitions – with that one blemish being the second-leg defeat against Arsenal in the last 16.
Jupp Heynckes' team have won all 13 Bundesliga games this year and are on course for the treble having reached the final of the German cup following a 6-1 semi-final win over Wolfsburg.
Club legend: Bayern president Uli Hoeness arrives at the Allianz Arena
Flying the flag: Bayern Munich and Barcelona fans gathered outside of the Allianz Arena
19.18: From InfostradaLive:
Victor Valdes plays his 48th CL KO match, overtaking Ryan Giggs (47) as player with most CL KO appearances.
19.13: Full line-ups from the Allianz Arena:
Bayern Munich v Barcelona
Bayern Munich: Neuer, Lahm, Boateng, Dante, Alaba, Javi Martinez, Schweinsteiger, Robben, Muller, Ribery, Gomez. Subs: Starke, Van Buyten, Shaqiri, Rafinha, Pizarro, Gustavo, Tymoschuk.
Barcelona: Valdes, Dani Alves, Pique, Bartra, Jordi Alba, Xavi, Busquets, Iniesta, Sanchez, Messi, Pedro. Subs: Pinto, Fabregas, Villa, Thiago, Montoya, Abidal, Song.
Referee: Viktor Kassai (Hungary)
19.08: From OptaPaolo:
25 – Bayern have always scored at home in the Champions League against Spanish opposition (13 games), scoring 25 goals in total. Assurance.
Way back when: Bayern Munich's Stefan Effenberg (right) tracks Barcelona's Sonny Anderson
Revenge: First leg goals from Lionel Messi, Samuel Eto'o and Thierry Henry helped Barcelona thump Bayern Munich 5-1 on aggregate in the 2009 Champions League quarter-finals
19.05: Bayern Munich won two Champions League group stage meetings in 1998, but Barcelona finally triumphed over the German side when they strolled to a 5-1 aggregate victory in the Champions League quarter-finals four years ago.
In fact they effectively won the tie by half-time of the first leg at the Nou Camp, following a brace from Lionel Messi and strikes from Thierry Henry and Samuel Eto'o.
19.00: Despite their regular participation in Europe's top competition – these sides have only clashed in three previous seasons.
The first was in the 1996 UEFA Cup semi-final when Bayern edged through 4-3 on aggregate – a tie where in the clash at the Nou Camp, Sergio Busquets' (who starts tonight) father Carles featured – as did Pep Guardiola.
18.55: Mario Mandzukic is suspended for Bayern, so therefore Mario Gomez plays up top. The more agile Jerome Boateng starts in front of Daniel van Buyten.
French following: A fan holds a France flag with Bayern's Franck Ribery on the front
18.50: So Messi returns for Barcleona and will lead an attack along with Pedro Rodriguez and Alexis Sanchez. Marc Bartra starts in defence in place of injured pair Javier Mascherano, Carlos Puyol and the suspended Adriano.
18.45: Barcelona starting XI:
Valdes, Alves, Bartra, Pique, Alba, Xavi, Busquets, Iniesta, Pedro, Messi, Alexis.
18.40: Bayern Munich starting XI:
Neuer, Lahm, Boateng, Dante, Alaba, Schweinsteiger, Martinez, Robben, Muller, Ribery, Gomez.
On the move: Mario Gotze (centre) will join Bayern Munich this summer
18.35: Bayern Munich have already been making headlines today, after it emerged Mario Gotze will join the club from Borussia Dortmund for 32m in what will be Pep Guardiola's first signing when he takes over at Munich this summer.
A huge statement of intent that, with the 20-year-old midfielder one of Europe's most highly sought after players.
18.30: From OptaJean:
1 – Barcelona have only won one of their 6 competitive encounters with Bayern Munich (D2, L3). Stress.
18.25: The fact that Barcelona are not huge favourites (if they are favourites at all) to win tonight shows just how far Bayern Munich have come this season.
They continue to shine in Europe of course but their domestic form has been nothing short of devastating – it should be quite a contest.
Back in business: Lionel Messi is poised to return for Barcelona
18.20: It's been a lovely sunny St. George's Day in the UK, and the weather is looking good in Munich too ahead of tonight's game. It's 16 degrees at the Allianz Arena where fans are already arriving.
18.15: No full team news yet but it seems Lionel Messi is fully fit for Barcelona, having not featured since coming off the bench in the quarter-final win against Paris Saint-Germain in the last round. That's a big boost for Barca who have stuttered at times on their travels around the continent this term.
18.10: There may be no English teams left but what a final four we have in this season's Champions League!
As it turns out it will be a double dose of Spain v Germany, and while Real Madrid are favourites to edge past Borussia Dortmund, it appears much closer between Bayern Munich and Barcelona – the latter of course, the main event this evening.
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On the ball: Bayern Munich's Bastian Schweinsteiger trains in preperation for the semi-final