Julio Chavez, the captain of Chivas USA's Under-18 team, has died in an car accident at the age of 19.
The club said the defender had been killed in Modesto, California - his home town - on Monday.
Chavez had been part of the Chivas USA youth academy for three years. They will honour his memory by wearing black armbands with his name and number on them, while a silence will also be held before they play LA Galaxy on Sunday.
He is survived by his parents, Francisco and Isabel, and siblings Francisco, Claudia, Rafael and Cecilia.