Possible line-ups First leg: Man. United 0-1 Barcelona Barcelona: Ter Stegen; Semedo, Piqué, Lenglet, Alba; Rakitić, Busquets, Arthur; Messi, Suárez, Dembélé Out: Rafinha (knee) Doubtful: Vermaelen (hamstring) Misses next match if booked: Busquets, Semedo Manchester United: De Gea; Dalot, Lindelöf, Smalling, Young; McTominay, Fred, Pogba;...