Ahead of Thursday's UEFA Champions League second round draw, ManUtd.com runs the rule over each of the Reds' six potential opponents...
Tipped to prop up a group containing Barcelona, Benfica and Spartak Moscow, Neil Lennon's Hoops have arguably been this season's surprise package in Europe. Their form at Celtic Park remains imposing, but the ability to cede possession yet still carry menace away from home has been the SPL side's biggest step forward. A growing force.
United can draw upon mixed memories of facing the Portuguese champions, most recently in 2009's Ronaldo-inspired quarter final triumph. Though Hulk's departure to Zenit stripped Porto of their main asset, Vitor Pereira's side still has enough South American swagger to pose problems - and rumoured Reds target James Rodriguez is developing into a formidable winger.
Though the most imposing opponent United could face, Jose Mourinho's side haven't matched last term's sparkling form in winning La Liga and reaching the Champions League semi-finals. Studded with talent, Real still found themselves outshone in the group stages by Borussia Dortmund, whose high-octane pressing game yielded four points and suggested how to nullify the Spanish giants.
This year's dark horses, Shakhtar are also the only potential opponent for