Warren Zaïre-Emery has made the most career appearances by a player younger than 20 in the Champions League, with 33 appearances.

most appearances before turning 20 years old by a player

	NAME	M	Rating	MIN	START	G	G/M	A	G+A	PK	FK	SH	SOT	WOOD	TCH	TCH-BOX	OFF
1	Warren Zaïre-Emery W. Zaïre-Emery	33	7.08	2,063	22	2	0.06	3	5	0	0	24	5	1	1,580	47	1
2	Lamine Yamal L. Yamal	28	7.37	2,094	25	7	0.25	7	14	1	0	89	31	4	1,653	174	3
3	Cesc Fàbregas C. Fàbregas	26		2,049	22	2	0.08			0
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	Pau Cubarsí P. Cubarsí	22	6.59	1,676	20	0	0.00	1	1	0	0	4	2	0	1,547	8	0
9	Roque Santa Cruz R. Santa Cruz	21		775	7	1	0.05			0
10	Jamal Musiala J. Musiala	20		993	11	2	0.10	3	5	0	0	18	8	1	629	69	1
11	Nigel de Jong N. de Jong	20		1,300	14	2	0.10			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	7.27	740	8	5	0.31	3	8	0	0	32	17	2	550	49	4
16	Mathys Tel M. Tel	16	6.88	371	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	Myles Lewis-Skelly M. Lewis-Skelly	15	6.97	920	11	0	0.00	3	3	0	0	3	1	1	551	7	0
23	Geovany Quenda G. Quenda	15	6.84	1,105	13	2	0.13	3	5	0	0	18	7	1	644	34	0
24	Gio Reyna G. Reyna	15		797	7	0	0.00	4	4	0	0	9	2	0	539	37	3
25	Jadon Sancho J. Sancho	15		1,086	12	3	0.20	3	6	0	0	21	11	1	897	60	4