Diego Costa scored the most goals by a Chelsea player in the Premier League in his first season, with 20 goals.

most goals in their first pl season by a chelsea player

NAME	G	SEASON	CLUB	M	MIN	START	G/M	A	G+A	PK	FK	SH	SOT	WOOD	TCH	TCH-BOX	OFF
Diego Costa	20	2014-15	Chelsea	26	2,083	24	0.77	3	23	1	0	76	37	2	1,107	3	25
Nicolas Jackson	14	2023-24	Chelsea	35	2,810	31	0.40	5	19	0	0	80	41	3	1,135	173	28
Mark Stein	13	1993-94	Chelsea	18	1,617	18	0.72	4	17	3
Álvaro Morata	11	2017-18	Chelsea	31	2,067	24	0.35	6	17	0	0	79	34	1	1,006	160	29
Tore André Flo	11	1997-98	Chelsea	34	1,713	16	0.32	2	13	0
Didier Drogba	10	2004-05	Chelsea	26	1,634	18	0.38	5	15	0
Hernán Crespo	10	2003-04	Chelsea	19	1,145	13	0.53	0	10	0
Eiður Guðjohnsen	10	2000-01	Chelsea	30	1,570	17	0.33	6	16	0
Paul Furlong	10	1994-95	Chelsea	36	2,823	30	0.28	4	14	0
Christian Pulisic	9	2019-20	Chelsea	25	1,727	19	0.36	4	13	0	0	63	26	1	1,138	145	3
Samuel Eto'o	9	2013-14	Chelsea	21	1,321	16	0.43	2	11	0
Eden Hazard	9	2012-13	Chelsea	34	2,637	31	0.26	10	19	2
Gianluca Vialli	9	1996-97	Chelsea	28	2,103	23	0.32	4	13	1
Graham Stuart	9	1992-93	Chelsea	39	2,866	31	0.23	7	16	0
Mick Harford	9	1992-93	Chelsea	28	2,400	27	0.32	2	11	0
André Schürrle	8	2013-14	Chelsea	30	1,325	15	0.27	2	10	0
Gianfranco Zola	8	1996-97	Chelsea	23	1,971	22	0.35	9	17	0
Gavin Peacock	8	1993-94	Chelsea	37	3,286	37	0.22	5	13	0
Mason Mount	7	2019-20	Chelsea	37	2,874	32	0.19	5	12	0	1	78	29	3	1,861	135	4
Pedro	7	2015-16	Chelsea	29	2,043	24	0.24	3	10	0	0	57	16	1	1,480	0	5
Salomon Kalou	7	2006-07	Chelsea	33	1,940	19	0.21	2	9	0
Arjen Robben	7	2004-05	Chelsea	18	1,261	14	0.39	9	16	0
Roberto Di Matteo	7	1996-97	Chelsea	34	2,893	33	0.21	1	8	0
John Spencer	7	1992-93	Chelsea	23	1,332	13	0.30	4	11	0
Timo Werner	6	2020-21	Chelsea	35	2,606	29	0.17	8	14	0	0	80	32	5	1,228	187	26