Chelsea v Barcelona - Roberto Di Matteo Part 1 (18.4.2012)<br /><br />Chelsea will be without defender David Luiz for their Champions League semi-final first leg against Barcelona.<br />The Brazilian centre-half injured his hamstring during the FA Cup win over Tottenham at the weekend and has been ruled out for a fortnight.<br />Gary Cahill could start in his place while Branislav Ivanovic is available.<br />Barcelona defender Gerard Pique has been out with a thigh strain but is back in contention, while David Villa and Eric Abidal remain sidelined.<br />The match is a repeat of the 2009 semi-final, which Barcelona won with a stoppage-time strike from Andres Iniesta.<br /><br />"Chelsea were strong in 2009 and this year they will be very strong, dangerous and focused," said Iniesta. "And playing at their ground, the atmosphere will multiply that."<br />Barcelona could yet compete in an all-Spanish final if Real Madrid defeat Bayern Munich in the other semi-final.<br />But Iniesta added: "All of our thinking and concentration should be on this game against Chelsea. If we think about anything else besides Chelsea, we'll be making a big mistake."<br />Blues midfielder Frank Lampard was a member of the team that lost in 1999 and believes the London club must avoid having any players dismissed if they are to overcome their Spanish opponents.<br />Chelsea have lost three of their 10 meetings with Barca since April 2000 - and have had a player sent off in each defeat.<br />"Discipline is a huge fact at this level," said Lampard. "To play a man down against Barcelona is very tough.<br />"We have to tackle and close space, but we've got a good discipline in our team. Keeping 11 on the pitch is crucial."<br />The England midfielder is also advocating a high-tempo pressing game as Chelsea try to shut down their accomplished opponents.<br />"I think it's imperative to play a pressing game," added Lampard.<br />"There's no way you can be passive against them, whether you push or defend deep. We'll have a game plan to attack them and it's important to have a sen
