Liverpool's pursuit of a return to the Champions League brings into the club's reach the first opportunity to claim a share of the extra riches available from the present Uefa television deal.
United's victory in last season's Europa League earned them a place in this season's Champions League, despite Jose Mourinho's men only finishing sixth in the Premier League.
Who joins Chelsea in Pot One?
Liverpool and Celtic booked their places in the group stage this week, coming through high-scoring ties against Hoffenheim and Astana respectively to take a seat at the top table for the draw in Monaco on Thursday afternoon.
When do the group stages start?
The Reds will avoid fellow Premier League teams Chelsea and Liverpool (Manchester City and Tottenham Hotspur are also in Pot two) as a result of the UEFA rule that two teams from the same country can not be drawn against each other at this stage of the competition.
And the Europa League draw?
Pot 4: CSKA Moscow/, Maribor, Celtic, APOEL/, Feyenord, FK /, Leipzig, and Steaua Bucharest/.
At the moment, Real Madrid are the favourites* to be outwright winners at odds of 4/1, then Paris St-Germain 6/1, Bayern Munich 6/1, Barcelona 13/2, Manchester City 12/1, Chelsea 14/1, Man Utd, 14/1, Juventus 14/1 and Atletico Madrid 16/1.