Welcome to Eurosport-Yahoo!'s live text commentary of the crunch Champions League semi-final second leg between Barcelona and Chelsea at the Camp Nou.

Bosingwa comes on to replace Cahill, and it will mean a defensive reshuffle for Chelsea with Ivanovic moving into the middle to partner Terry.

Finally, it looks as though Cahill will come off as he hobbles away to the side of the pitch once more and what a blow that is for the defender.

Busquets, Xavi and Messi exchange passes deep inside the Chelsea half, and Di Matteo really needs to take control of the situation with Bosingwa poised to come on.

Terry signals to the Chelsea bench for Cahill to be given two minutes to see if he can shake off that injury, but if it's a hamstring strain then that will be him done.

Cahill hobbles off to the side of the pitch, and Bosingwa is warming up vigorously on the touchline now. Meanwhile, Cech sprints out to clear a loose ball as play continues.

Cahill slips inside the Chelsea box as he battles away with Sanchez, and he could be in a spot of bother as he holds his hamstring and limps around rather gingerly. The physio charges out.

Cuenca jinks his way down the right and attempts to beat Cole with a few step-overs, but Ramires helps out and is able to bring the ball forward for the visitors.

What a chance for Messi! Sanchez unselfishly plays Messi in down the right of the Chelsea penalty area, but he drives his shot into the side netting with Cole caught out of position!

Xavi dinks a precise through ball into the path of Alexis Sanchez as the forward gets in behind Terry, but Cech is quickly out to clear the danger.

Drogba holds the ball up on halfway, before Messi trips Mata and Chelsea have a free kick, which is duly wasted as Pique then brings the ball forward from deep.

The first half is underway at the Camp Nou, and Chelsea enjoy some early possession in their white change strip. Ramires and Cole exploit some space down the Chelsea left, with Valdes out to smother a loose ball.

To say that the atmosphere is frenzied would be an understatement. The players emerge and the crowd go absolutely crazy with even more tiny flags than you see at Stamford Bridge on a Champions League night. Cuneyt Cakir of Turkey is the referee, and we're all set for kick-off...

We're just five minutes from kick off now at the Camp Nou. It's time for a possession-related stat, because they seem to be pretty fashionable right now: Chelsea only completed 158 passes in the first leg at Stamford Bridge, the only team that registered fewer successful passes in a Champions League game this term was APOEL Nicosia (124, in a 0-3 home defeat to Real Madrid in the quarter-finals).

"The 90 minutes at Stamford Bridge at least showed there is truth in the maxim that a victory has to be worked for. Chelsea won because they converted one of the few chances they had. And Barcelona lost for precisely the opposite reason: because they failed to convert the many chances they created." Those are the words of Eurosport expert Rafa Benitez.

Meanwhile, if you get fed up of following Lionel Messi, Xavi et al in action, you can always find out who wins the midfield battle between Mark Davies and Chris Herd at Villa Park.

Barcelona's 54-game unbeaten run at the Camp Nou came to an end at the weekend thanks to Real Madrid's 2-1 success. Coupled with the defeat at Chelsea last week, it consigned Barcelona to their first back-to-back losses since May 2009.

So the big team news this evening is Dani Alves only making the substitutes' bench as coach Pep Guardiola makes two changes from the side that lost in London, with Gerard Pique and Isaac Cuenca drafted in. How will that affect Barcelona's offensive options and do you agree with the changes? Bradley Tucker believes Torres should have started with Mata in behind him and Drogba. Jonathan Yu thinks Chelsea will win 2-1.

The latest Euro Club Index rankings see Barcelona remain Europe's top-ranked side despite losing to both Chelsea and Real Madrid over the past week. (Don't ask me...)

Okay, okay, here's another few stats: Barcelona last beat Chelsea in February 2006 when the sides met in the last 16 of the Champions League. The Catalans won 2-1 at Stamford Bridge. The two teams have met four times in knockout ties in the Champions League, with the Catalans progressing on three occasions.

Joloccini reckons Barcelona will get caught with an overly aggressive approach with Chelsea prevailing 2-1, while Serge Blake believes Barca will win 2-1. Meanwhile, Graeme Souness thinks Chelsea are unlikely to ride their luck twice. Everyone has their own opinion, and this is how the satchel swingers go: Barcelona 1/4, Chelsea 9/1, Draw 11/2.

Is Drogba a diver? Gerard Pique does not think so. A diplomatic Pique, who could be charged with marking Drogba in the second leg, said: "I believe in Drogba that, every time he fell down, it was because he was in pain, or he felt a kick on him. I don't think that, when Drogba fell down, he was trying to act or dive." What do you think?