All Times (GMT) Tuesday 12th February 2013 19 45: Celtic vs Juventus 19 45: Valencia vs Paris Saint Germain Wednesday 13th February 2013 19 45: Real Madrid vs Manchester United 19 45: Shakhtar Donetsk vs Borussia Dortmund Tuesday 19th February 2013 19 45: Arsenal vs Bayern Munich 19 45: FC Porto vs Malaga Wednesday 20th February 2013 19 45: AC Milan vs Barcelona 19 45: Galatasaray vs Schalke (For more sports news and updates, follow Ahram Online Sports on Twitter at @AO Sports and on Facebook at AhramOnlineSports)