Old TraffordKick-off: 19.45 BSTTV: SS2 Chelsea will take heart from the clubs’ last meeting at Old Trafford last April, when they won 2-1 to virtually seal the league title. United have not lost at home since, though, and they have never lost a European tie in which they won the first leg away from home. In fact, the feat has only been achieved twice in Champions League history.KEY CLASHES: Rafael v Florent Malouda Yuri Zhirkov was preferred to Malouda on the left flank in the first leg, but with Chelsea chasing the game, Carlo Ancelotti is likely to opt for Malouda’s greater pace and impetus. Malouda will be allowed to play further forward than Zhirkov was, posing Rafael (or John O’Shea if the Brazilian fails to overcome injury) a more imminent threat. Chelsea’s front line should benefit...