As expected, Lamine is exempted from fasting during matchdays
as.com
"Lamine Yamal, who is actively participating in the month of Ramadan this year (from March 1 to 30), has permission from the relevant religious authorities to make exceptions on match days. A detail that helps make the '19's' fasting more bearable for the club, which, however, considers that the player is already in good hands through the head of nutrition for the first team, Silvia Tremoleda"

Lamine y el Ramadán: exento los días de partido
El delantero, que jugó sólo 56 minutos en Lisboa, cuenta con el permiso de las autoridades religiosas competentes para hacer excepciones en la competición.
"Lamine Yamal, who is actively participating in the month of Ramadan this year (from March 1 to 30), has permission from the relevant religious authorities to make exceptions on match days. A detail that helps make the '19's' fasting more bearable for the club, which, however, considers that the player is already in good hands through the head of nutrition for the first team, Silvia Tremoleda"