Jose Mourinho says quarter-final opponent Chelsea can focus solely on the FA Cup, while Man United have other priorities.
Standard Liege and Gent's mid-table clash finished in a 1-1 deadlock.
Lyon scored three goals in ten minutes to complete a remarkable turnaround in a 4-2 Ligue 1 victory over Dijon.
Dundee held their lead from two first-half goals to earn their first home win over Rangers in 25 years.
Owen Coyle hopes Blackburn Rovers can use their effort against Man United as a catalyst to avoid relegation to League One.
Four players scored for Roma in a dominant victory over Torino at the Stadio Olimpico.