The Champions League, Europa League and Europa Conference League draws take place on Monday, 18 December, with seven British clubs waiting to discover their fate.
Holders Manchester City, and Arsenal, won their groups to reach the Champions League last 16, but Newcastle, Manchester United and Scottish champions Celtic dropped out of Europe entirely.
In the Europa League, Brighton, Liverpool, Rangers and West Ham all went straight into the last 16.
And in the Europa Conference League Aston Villa will be in the last 16, but Aberdeen are out after finishing third in Group G.
BBC Sport gives you the lowdown on the draws.
When is the Champions League draw and where?
The Champions League last-16 draw will be held on Monday, 18 December at 11:00 GMT at the House of European Football in Nyon, Switzerland.
How does the draw work?
Each group winner will be seeded and drawn against a team who finished second in another group, who are all unseeded. Teams cannot draw a club who are from the same country, or a team who were in the same group as them.
When is the last 16 played?
The first legs of the last 16 will be played across two weeks, 13-14 and 20-21 February 2024, with the second legs on 5-6 and 12-13 March.
The draws for the quarter-finals and semi-final will be done together on Friday, 15 March.
Who has gone through in the Champions League?
Seeded: Arsenal, Atletico Madrid, Barcelona, Bayern Munich, Borussia Dortmund, Manchester City, Real Madrid, Real Sociedad.
Unseeded: Copenhagen, Inter Milan, Lazio, RB Leipzig, Napoli, Paris St-Germain, Porto, PSV Eindhoven.
When is the Europa League draw and where?
The Europa League knockout play-off draw will be held an hour later than the Champions League last-16 draw on Monday, 18 December at 12:00 GMT at the House of European Football in Nyon, Switzerland.
How does the draw work?
Each runner-up from the Europa League group stages will be seeded and drawn against teams who finished third in the Champions League group stages, who are all unseeded. Teams cannot draw a club who are from the same country.
The eight group winners advance straight to the last 16 where they will be seeded against the eight knockout play-off round winners. Again, teams cannot draw a club who are from the same country.
When is the knockout play-off round played?
The first legs of the play-offs will be played on 15 February 2024, with the second legs on 22 February.
The draw for the round of 16 will be held on 23 February, with the first legs played on 7 March and the second legs taking place on 14 March.
Who is through in the Europa League?
Group winners and into the last 16: Atalanta, Bayer Leverkusen, Brighton, Liverpool, Rangers, Villarreal, Slavia Prague, West Ham.
Seeded in play-offs: Freiburg, Marseille, Qarabag, Rennes, Roma, Sparta Prague, Sporting Lisbon, Toulouse.
Unseeded in play-offs: Benfica, Braga, Feyenoord, Galatasaray, Lens, Milan, Shakhtar Donetsk, Young Boys.
When is the Europa Conference League draw and where?
The Europa Conference League knockout play-off draw will be held on Monday, 18 December at 13:00 GMT at the House of European Football in Nyon, Switzerland.
How does the draw work?
The eight runners-up from the Europa Conference League group stages will be seeded and drawn against teams who finished third in the Europa League group stages, who are all unseeded. Teams cannot draw a club who are from the same country.
Like the Europa League, the eight group winners advance straight to the last 16 where they will be seeded against the eight knockout play-off round winners. Again, teams cannot draw a club who are from the same country.
When is the knockout play-off round played?
The first legs of the play-offs will be played on 15 February 2024, with the second legs on 22 February.
The draw for the round of 16 will be held on 23 February, with the first legs played on 7 March and the second legs taking place on 14 March.
Who is through in the Europa Conference League?
Group winners and into the last 16: Aston Villa, Club Bruges, Fenerbahce, Fiorentina, Lille, Maccabi Tel Aviv, PAOK, Viktoria Plzen.
Seeded in play-offs: Bodo/Glimt, Dinamo Zagreb, Eintracht Frankfurt, Ferencvaros, Gent, Legia Warsaw, Ludogorets, Slovan Bratislava.
Unseeded in play-offs: Ajax, Maccabi Haifa, Molde, Olympiacos, Real Betis, Servette, Sturm Graz, Union Saint-Gilloise.
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