The eight teams dropping into the competition from the Champions League are ranked by their points total from the elite tournament and Celtic are not among the top four, who will be seeds.
Italian champions Juventus qualified from Group D after a 2-0 victory against Olympiakos in Greece, and Roma are through from Group C thanks to a 1-0 win at home to Qarabag. Real Madrid are also confirmed to finish second and will be joined by three more sides - now scheduled to be Sevilla, Shakhtar Donetsk and Porto.
Which teams are through to the Champions League Round of 16 stage?
A balanced draw has two-time defending champion Real Madrid and Bayern Munich among five former winners in the pot of unseeded teams who were group runners-up. Teams from the same country cannot play each other in the last 16, which limits who Chelsea can play in first knockout stage.
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Chelsea: Barcelona, Paris Saint-Germain, Besiktas, Spartak Moscow or Sevilla.
Anything else you need to know?
Manchester United: Bayern Munich (4), Juventus (5), Seville (7), Shakhtar Donetsk (16), Porto (12) or Real Madrid (1).
Barcelona's possible opponents: Basel, Bayern Munich, Chelsea, Shakhtar Donetsk and Oporto.
Group winners are drawn against second place sides and play away first, with the second legs at home.