Goal looks at the most promising youngsters who will be on show this season alongside some of football's biggest stars
In football's most prestigious club competition, Europe's elite sides will battle it out over the course of the season to be crowned champions of the continent.
As well as the established stars who will look to shine for their sides, there is a whole host of promising young players looking to grab their share of the spotlight at the absolute pinnacle of the game.
Goal takes a look at five of the youngsters who are poised to impress in this season's Champions League.
With a goal and an assist in Porto's playoff second-leg win over Lille, Yacine Brahimi played a pivotal role in the Portuguese giants reaching the group stages of the competition. His magnificent free kick was followed by a perfect pass which allowed Jackson Martinez to put the tie beyond doubt.
The summer signing from Granada has shown to be a very fast and skilful player, having attempted and completed more dribbles than any other player in La Liga last term – 98 more than second most prolific dribbler Lionel Messi – and his success rate of just under 50 per cent is respectable.
Although an attacking midfielder, the 24-year-old is not particularly trigger happy as he prepares to drive towards goal and pick out passes to the flanks or link up with the strikers.
It is here his partnership with Martinez will see him become a key player for the Dragons in the Champions League.
The 19-year-old joined Arsenal from Southampton for €20 million this summer and so far has shown to be one of the brightest defensive talents in England at the moment.
Chambers was seen as a right-back during his days in the Saints youth academy but was earmarked as a possible centre-back last season and has looked instantly at home in the role with the Gunners so far.
Versatile, comfortable on the ball and confident going into tackles, the teenager is inexperienced but seems to be learning quickly.
Chambers is not expected to break up the partnership of Per Mertesacker and Laurent Koscielny at the heart of the Gunners backline. However, as they look to compete on several fronts, he provides excellent cover at the back should Arsene Wenger look to rotate the squad or for any injuries or suspensions to one of the central defenders or right-back Mathieu Debuchy - who was sent off against Besiktas in the playoff.
After an excellent first season in the Bundesliga with a struggling Hamburg side, Hakan Calhanoglu made the step up this summer to Bayer Leverkusen, where great things are expected of him.
The 20-year-old attacking midfielder has excellent potential and will be a vital component of a promising Leverkusen team.
Mobile, quick and intelligent, he fits right into the high, well organised pressing game of new coach Roger Schmidt and will be central to their attacks with his passing ability, shooting prowess and eye for a pass.
Playing in behind Stefan Kiessling and being flanked by Heung-Min Son and Karim Bellarabi, he is set for a very productive season in the Bundesliga and Champions League.
A strong, technically excellent young midfielder, Geoffrey Kondogbia has been an important player for Monaco following his move from Sevilla last summer.
The tall, intelligent and composed defensive midfielder will be a crucial part of the team looking to break into the small group of elite European clubs following their promotion to Ligue 1 in 2013.
Kondogbia is good at breaking up opposition play, which will be vital to his team as they come up against top-class attacks in the tournament.
He is also composed and intelligent on the ball. The 21-year-old has excellent passing ability but is also confident and excellent at bringing it forward - having completed 27 of the 39 dribbles he attempted in the league.
With 50 La Liga appearances in the past two seasons, 20-year-old Aymeric Laporte has developed into a crucial player for Athletic Bilbao.
The France Under-21 international enjoyed an excellent 2013-14 campaign, making 35 league appearances as he played a huge role in the Basque side finishing fourth and conceding just one more goal than Real Madrid.
With his strong tackling, excellent passing ability, strength in the air, bravery and reading of the game, the precocious centre-back's all-round game is developing smoothly and he will be a valuable asset for Ernesto Valverde's side in their return to the Champions League after a 16-year absence.