Foes reunited in Champions League last 16 Yahoo! News UK

A 5-0 thrashing of Jose Mourinho's Real Madrid in November was widely heralded as one of the most complete performances in the sport's history and they recently went on a record 16-game winning streak in La Liga.Lionel Messi, winner of the inaugural FIFA Ballon d'Or award, has already scored 37 goals in all competitions to date and Arsenal know well what a devastatingly effective adversary he is.The Argentine dribbling maestro netted all four goals in Barca's 4-1 defeat of the Gunners at Camp Nou last year, following a thrilling 2-2 draw in the first leg.Arsenal coach Arsene Wenger concedes that Barcelona are even stronger than they were 12 months ago but feels that his team have also improved.