from: https://fematrend..com
Group winners (seeded): Barcelona (ESP), Bayern München (GER), Borussia Dortmund (GER), Juventus (ITA), Manchester City (ENG), Paris Saint-Germain (FRA), Porto (POR), Real Madrid (ESP)
Group runners-up (unseeded): Ajax (NED), Atlético Madrid (ESP), Liverpool (ENG), Lyon (FRA), Manchester United (ENG), Roma (ITA), Schalke (GER), Tottenham Hotspur (ENG)
Group winners (seeded): Barcelona (ESP), Bayern München (GER), Borussia Dortmund (GER), Juventus (ITA), Manchester City (ENG), Paris Saint-Germain (FRA), Porto (POR), Real Madrid (ESP)
Group runners-up (unseeded): Ajax (NED), Atlético Madrid (ESP), Liverpool (ENG), Lyon (FRA), Manchester United (ENG), Roma (ITA), Schalke (GER), Tottenham Hotspur (ENG)

DRAW BASICS
There are two pots – one of seeded teams and one of unseeded teams.
No club can be drawn against a team that played in their group or a side from their own national association.
Seeded group winners are away in the round of 16 first legs on 12/13 and 19/20 February and at home in the return matches on 5/6 and 12/13 March.
Barcelona (ESP)
Can be drawn against: Ajax, Liverpool, Lyon, Man. United, Roma, Schalke
Group stage: W4 D2 L0 F14 A5
Top scorer: Lionel Messi (6)
Last season: quarter-finals
European Cup best: winners x5 (1992, 2006, 2009, 2011, 2015)
Domestic position: 1st
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Source:https://fematrend..com/2018/12/uefa-has-introduces-this-seasons-last.html