Holders Barcelona and English side Arsenal both saw victory elude them in their opening matches of the Champions League group stages on Tuesday as late goals left them with draws.

A superb second-half freekick by David Villa looked to have secured Barca the three points after they had dominated the match with AC Milan, despite Alexandre Pato's early goal, only for Thiago Silva to head home in the third minute of time added-on to make it 2-2.