The chaaaaaaaampions...
It's that time of the year again when that famous anthem starts ringing around stadiums of the elite as the club season begins.
The group stage of this season's competition gets under way this week and BBC Sport looks at some of the things to watch out for.
It took Erling Haaland just four games to hit his first hat-trick for Manchester City in their win over Crystal Palace.
The City player will have a quick reunion with his former team after they were drawn in the group stage of the European competition.
The first game of City's season is at Sevilla this week, but next week they'll be playing at home against the Germans.
Haaland has scored 27 goals in 25 appearances for three different clubs in the European club competition, and is hoping to continue his good form for City.
Haaland will face the team he left this summer to join Barcelona in the group stage.
After playing Czech side Viktoria Plzen on Wednesday, Barcelona and Lewandowski head to Munich on Tuesday. The toughest group in this season's competition is made up of Italian teams.
Sadio Mane has scored five goals in seven appearances in the German league and cup in place of the injured Robert Lewandowski.
One of the most eye-catching draws of the group stage was in Group A, where Rangers andLiverpool will meet.
The two sides will play each other for the first time in this season's competition on October 4th and 12th.
Celtic and Rangers are back in the same league for the first time in seven years, while Rangers are back in the European competition for the first time in five years.
The Russian invasion of Ukraine in February 2022, which resulted in the suspension of all football in the country, was followed by the return to action of the Ukrainian premier league.
They are in a group with Real Madrid and Celtic.
Shakhtar's home games will be played at Legia Warsaw's Stadion Wojska Polskiego, which is close to the Ukrainian border.
They begin their Champions League campaign at Leipzig in Germany on Tuesday night but their first 'home' game is against Celtic on Wednesday, 14 September, and they are being well backed by Polish fans after 18,000 tickets for the game were sold in one day.
Paris St-Germain is one of the favorites to win the European club competition.
Angel di Maria will have an early reunion with his old club as he returns to Paris on Tuesday, as both sides want to get to the business end of the competition.
One of Di Maria's team-mates is a former Manchester United target.
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