Warren Zaïre-Emery has made the most career appearances by a player younger than 21 in the Champions League, with 44 appearances.

most games before turning 21 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	44	7.06	2,931	32	2	0.05	4	6	0	0	29	5	1	2,206	62	3
2	Jude Bellingham J. Bellingham	34		2,810	32	10	0.29	10	20	0	0	58	19	0	2,212	115	2
3	Cesc Fàbregas C. Fàbregas	34		2,735	30	6	0.18			0
4	Lamine Yamal L. Yamal	33	7.49	2,544	30	11	0.33	9	20	3	0	109	41	4	2,010	216	5
5	Roque Santa Cruz R. Santa Cruz	32		1,505	15	4	0.13			0
6	Iker Casillas I. Casillas	32		2,812	31	0	0.00			0
7	Kylian Mbappé K. Mbappé	30		2,225	25	19	0.63	11	30	0	0	87	45	1	1,205	219	21
8	Désiré Doué D. Doué	29	7.32	1,609	17	10	0.34	7	17	0	0	60	28	2	1,316	116	7
9	Jamal Musiala J. Musiala	29		1,653	20	4	0.14	4	8	0	0	33	11	1	1,038	101	2
10	Eduardo Camavinga E. Camavinga	29		1,656	17	0	0.00	3	3	0	0	15	4	1	1,404	27	1
11	João Neves J. Neves	27	7.19	2,057	23	1	0.04	2	3	0	0	29	7	2	1,895	48	1
12	Pau Cubarsí P. Cubarsí	26	6.58	1,989	24	0	0.00	1	1	0	0	6	3	0	1,886	11	0
13	Bojan	26		847	8	5	0.19			1
14	Theo Walcott T. Walcott	25		1,122	11	4	0.16			0
15	Nigel de Jong N. de Jong	25		1,697	18	5	0.20			0
16	Gavi	24	6.87	1,257	14	1	0.04	0	1	0	0	12	3	0	848	32	4
17	Phil Foden P. Foden	24		1,543	17	6	0.25	5	11	0	0	45	22	1	1,210	78	2
18	Jamie Gittens J. Gittens	23	6.71	1,086	13	5	0.22	0	5	0	0	31	8	2	579	63	3
19	Trent Alexander-Arnold T. Alexander-Arnold	23		1,921	22	1	0.04	4	5	0	0	20	3	1	1,819	24	2
20	David Alaba D. Alaba	23		1,675	18	2	0.09			0
21	Christian Pulisic C. Pulisic	22		1,427	15	2	0.09	2	4	0	0	37	12	2	1,019	123	6
22	Patrick Kluivert P. Kluivert	22		1,446	15	9	0.41			0
23	Rodrygo	21		938	10	7	0.33	6	13	0	0	27	13	1	630	68	1
24	Vinícius Júnior Vinícius	21		1,064	13	4	0.19	4	8	0	0	29	10	0	656	83	5
25	Jadon Sancho J. Sancho	21		1,469	16	5	0.24	6	11	1	1	29	15	1	1,239	79	5