Bayern München, Dynamo Kyiv and Manchester City all scored four as they started the 2016/17 group stage with commanding home victories, while last season's beaten finalists drew 0-0.
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Paris Saint-Germain 0-0 Arsenal
Paris's line-up included five players – Alec Georgen, Foda Touré, Felix Eboa Eboa, Antoine Bernede, Christopher Nkunku – who started last season's final against Chelsea.
Benfica 0-0 Beşiktaş
Weakened by José Gomes's promotion to the senior squad, Benfica failed to muster a shot on target. Gomes, Golden Player and top scorer at the 2016 UEFA European Under-17 Championship in Azerbaijan, registered seven in five games in the UEFA Youth League last term.
Dynamo Kyiv 4-1 Napoli (Rusyn 50 77, Mykhaylichenko 54, Lednev 81; Alibekov og 25)
Dynamo fell behind despite dominating the first period but eventually came good, Bogdan Lednev icing the cake with a late free-kick.
Barcelona 2-1 Celtic(Carles Pérez 3, Guillemenot 64; Aitchison 72)
The Barcelona class of 2013/14 overcame Celtic twice at this stage en route to winning the inaugural UEFA Youth League. The 2016/17 side made a victorious start to their campaign too, despite Jack Aitchison setting up a tense finale with a fine low finish.
Manchester City 4-1 Mönchengladbach(Nmecha 6pen 10, Hanraths og 58, Sancho 78; Yosef 75)
Lukas Nmecha teed City up for a comprehensive victory with two goals inside the opening ten minutes, his first coming after Brahim Diaz nutmegged his marker and played in Rodney Kongolo, who was fouled by Gladbach keeper Franz Langhoff.
Bayern München 4-2 Rostov (Shabani 17, Friedl 43 77pen, Crnički 87pen; Solovyev 37 90)
Penalties inside the last quarter of an hour from Marco Friedl and Mario Crnički increased Bayern's lead to 4-1. Rostov skipper Philipp Kondryukov was shown a second yellow for committing the foul which led to the latter spot kick.
PSV Eindhoven 0-0 Atlético Madrid
Atlético, the second-top scorers in last season's group stage with 25 goals, drew a blank in the Netherlands.
Club Brugge 2-1 Leicester City (Van Vaerenbergh 15 39pen; Muskwe 43)
Brugge prevailed in the battle of the debutants, Dennis Van Vaerenbergh's first-half double proving decisive. The forward converted a cross from the right and then tucked away a penalty after being felled by Leicester keeper Max Bramley.