Warren Zaïre-Emery has made the most career appearances by a player younger than 20 in the Champions League, with 30 appearances.

most apearances before turning 20 years old by a player

	NAME	M	MIN	START	G	G/M	A	G+A	PK	FK	SH	SOT	WOOD	TCH	TCH-BOX	OFF
1	Warren Zaïre-Emery W. Zaïre-Emery	30	1,761	19	2	0.07	3	5	0	0	17	3	1	1,326	39	1
2	Cesc Fàbregas C. Fàbregas	26	2,049	22	2	0.08			0
3	Lamine Yamal L. Yamal	25	1,848	22	6	0.24	6	12	1	0	81	27	4	1,381	151	3
4	Jude Bellingham J. Bellingham	23	1,819	21	6	0.26	5	11	0	0	35	12	0	1,427	63	1
5	Kylian Mbappé K. Mbappé	23	1,715	20	13	0.57	7	20	0	0	63	32	1	863	162	17
6	Bojan	23	787	7	5	0.22			1
7	Iker Casillas I. Casillas	23	2,070	23	0	0.00			0
8	Roque Santa Cruz R. Santa Cruz	21	775	7	1	0.05			0
9	Jamal Musiala J. Musiala	20	993	11	2	0.10	3	5	0	0	18	8	1	629	69	1
10	Nigel de Jong N. de Jong	20	1,300	14	2	0.10			0
11	Pau Cubarsí P. Cubarsí	19	1,500	18	0	0.00	1	1	0	0	4	2	0	1,321	8	0
12	Eduardo Camavinga E. Camavinga	19	837	7	0	0.00	1	1	0	0	8	2	0	653	17	1
13	Patrick Kluivert P. Kluivert	18	1,086	11	7	0.39			0
14	Theo Walcott T. Walcott	17	678	6	3	0.18			0
15	Désiré Doué D. Doué	16	711	8	5	0.31	3	8	0	0	32	17	2	550	49	4
16	Mathys Tel M. Tel	16	370	2	2	0.13	1	3	0	0	24	6	1	266	36	2
17	Ansu Fati A. Fati	16	578	5	3	0.19	2	5	0	0	25	9	0	426	57	2
18	Rúben Neves R. Neves	16	747	7	0	0.00	1	1	0	0	10	1	0	503		0
19	Max Meyer M. Meyer	16	869	9	1	0.06	1	2	0
20	Nwankwo Kanu N. Kanu	16	985	10	1	0.06			0
21	Brian Kidd B. Kidd	16	1,440	16	3	0.19			0
22	Gio Reyna G. Reyna	15	797	7	0	0.00	4	4	0	0	9	2	0	539	37	3
23	Jadon Sancho J. Sancho	15	1,086	12	3	0.20	3	6	0	0	21	11	1	897	60	4
24	Christian Pulisic C. Pulisic	15	973	10	1	0.07	2	3	0	0	29	9	2	652	92	3
25	Tomáš Rosický T. Rosický	15	1,277	15	3	0.20			0