The 32 teams in this year's Champions League group stage will discover their opponents this evening.
Celtic and Rangers are both in the competition for the first time in 15 years after Giovanni van Bronckhorst's side defeated PSV Eindhoven 1-0 in Holland on Wednesday night.
They will be joined in the draw by English sides Manchester City, Liverpool, Chelsea and Spurs, while the likes of Real Madrid, Bayern Munich, PSG and Barcelona are among the other big names involved.
Here's everything you need to know:
Where and when is it?
The draw will be made in Istanbul, where this season's final takes place, on Thursday, August 25.
What time does it start at?
It is scheduled to start at 5pm Irish and UK time, but these UEFA draws have a habit of starting slightly later.
What TV channel is it on?
BT Sport 1 will show the draw live, with their coverage starting at 4.45pm.
You can also follow updates with the Irish Mirror's live blog.
Pots
POT 1
Real Madrid
Eintracht Frankfurt
Manchester City
AC Milan
Bayern Munich
Paris Saint-Germain
FC Porto
Ajax
POT 2
Liverpool
Chelsea
Barcelona
Juventus
Atletico Madrid
Sevilla
RB Leipzig
Tottenham Hotspur
POT 3
Borussia Dortmund
FC Salzburg
Shakhtar Donetsk
Inter Milan
Napoli
Benfica
Sporting CP
Bayer Leverkusen
POT 4
Rangers
Dinamo Zagreb
Marseille
FC Copenhagen
Club Brugge
Celtic
Viktoria Plzen
Maccabi Haifa
Quotes corner
Celtic captain Callum McGregor: “We’ve played quite a few big teams but probably the one most of the Celtic fans would like is Real Madrid. I’ve not played against them yet but we know anybody we get drawn against will be a top team and a big challenge for us.”
Rangers manager Giovanni van Bronckhorst: “I know what it means for the fans, for the club, to be playing in the highest level in Europe, competing with the best teams.
“I think it is a proud moment for all of us.
“I have played many games as a player, coached my team Feyenoord in the Champions League and now I have the opportunity to experience it with Rangers so it is very proud moment.”
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