The UEFA Champions League is the most prestigious title in club football, and has been running since 1955, although it has had many changes to the tournament over time.
The 2016/17 final was held at the Principality Stadium in Cardiff, Wales.
Real Madrid retained the title by once again beating Atletico Madrid, this time the result being 4-1.
The ten play-off winners have now joined the 22 automatic entrants in the 2017/18 UEFA Champions League group stage. We look at the line-up ahead of Thursday's draw.
The UEFA Champions League draw takes place at the Grimaldi Forum in Monaco at 18:00CET on Thursday 24 August, with the eight teams in Pot 1 already confirmed.
Who's in the play-offs, who's already in the group stage and who got eliminated from qualifying earlier in the summer? Here is the full list of 2017/18 contenders.
CSKA Moskva, Sporting CP, Liverpool and APOEL have completed the UEFA Champions League group stage line-up along with Qarabağ, the first Azerbaijani team to qualify.
The last five spots in the UEFA Champions League group stage will be decided on Wednesday when the play-off second legs take place: here is how the ties stand.
Celtic, Maribor, Napoli, Olympiacos and Sevilla booked their places in the group stage at the expense of Astana, Hapoel Beer-Sheva, Nice, Rijeka and İstanbul Başakşehir respectively.
Keep track of all the ins and outs this summer for the 22 clubs already assured of a place in the UEFA Champions League group stage.
Real Madrid top the UEFA club coefficient rankings for the fourth season running while Spain remains the dominant national association coming into the 2017/18 campaign.
Liverpool won at home, Napoli enjoyed the first day of the season in Italy, and ten-man Sevilla drew their Liga opener. UEFA.com sees how the play-off contenders got on.
As the UEFA Champions League and UEFA Europa League play-offs get under way, UEFA celebrates the giants of the preliminary rounds.
Won most by: Real Madrid (10 times)
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