4. Kaka - The Forgotten Man
He was an unused sub for the first leg last month but the Brazilian possesses a highly impressive footballing CV, the former Ballon d'Or and FIFA World Player Of The Year has not really had much playing time under Jose Mourinho after only starting 13 times this season but in 2007 he single-handedly tore United apart scoring twice at Old Trafford for former club A.C Milan as they went on to become European Champions that season. At only 30 years old, Kaka is still a highly skilful player known for his pace, great vision and passing ability and could be a key player either as a starter or off the bench to ruin Manchester United chances of reaching the last 8 in the competition.