Messi drives forward on a Barca break and is cynically chopped down by Song, who receives a booking for the foul.

Iniesta combines with Messi, but as he tries to drive through the middle a swarm of Arsenal defenders close him down and Song steps in with a strong tackle.

Released by a precise pass from Villa, Messi races clear of the Arsenal defence but drags his finish wide as Szczęsny stays big to narrow the angle.

After Wilshere loses possession, Messi attempts a delicate chip from the edge of the box, but Szczęsny comfortably catches the effort.

Messi threads a perfectly weighted through ball to Villa, who beats the offside trap and coolly slots past Szczęsny to put Barcelona ahead.

Messi bundles the ball into the net after a scrappy passage of play, but the flag is up and the goal is ruled out for offside.

Driving at the Arsenal back line, Messi finds a yard of space but fires his shot into the side netting from a tight angle.

Messi again accelerates at Djourou and tries to slip a pass to a team-mate, but it runs too wide; moments later he shoots from an offside position and Szczęsny saves anyway.