F.C. Barcelona Football Formation

Lineup (4-3-3)

Playing puyol at left back will give Busquets a chance to play and will give barcelona the extra midfielder in a sense as in most games they do not do much defending anyway, this will be good as busquets is a defensive player anyway and with his height he would be better in that position, puyol's energy up and down the left flank will be useful also, giving him regular football too.
Playing Fabregas in a more attacking role will be good as we seen him get goals in the position for arsenal and will give xavi and iniesta the space in the middle to work the magic, feeding the likes of fabregas to cause trouble around the edge of the area.
Messi in the cenre of the three man attack is a better option as in some games he can become lost out on the right, but obviolsy from the position he can float from the midfield to the attack, so in a sense they can play without an out and out centre forward, as i beleive Villa plays great in the left sided attacking role like we seen for spain in the world cup. Pedro down the right wil be good as he adds pace and something different for the attacka nd contributes with goals when he gets into the box.