The Champions League is back, and with it comes a host of under-21 players looking to impress. Some, such as Liverpool 's Rio Ngumoha (17) and Arsenal 's Max Dowman (15), are so young that it may take some time for them to develop fully. Others, like Chelsea 's Estêvão and Real Madrid duo Franco Mastantuono and Dean Huijsen , moved for large transfer fees over the summer and are already well-known across Europe.

So here's a collection of U21 players who have yet to make a breakthrough, but will view this season's Champions League as the perfect place to do so.

- O'Hanlon: Ranking UCL field: PSG, Barcelona or Liverpool?

- Ogden: Champions League storylines to watch this season

- Johnson: A reminder of how the new UCL format works

Vasilije Adzic , 19, AM, Juvent

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