Yamal plates is a major injury doubt for of Barcelona The League met with Atletico Madrid next weekend.
Defeat of Barcelona 1-0 at Leganes eased their title challenge with just one goal difference separating them from Los Rojiblancos.
A dip in domestic form means the Catalans have won just one of their last six league games and their match with Atletico Madrid is now vital on December 21.
Lamine Yamal chose to sit against Leganes, after suffering an early ankle injury, but the risk did not pay off.
He was replaced in 75 minutes with great concern about his availability to take part in Barcelona's last game in 2024.
According to reports from World of Sportswill undergo tests within 24 hours to determine the extent of the problem, but the first signs are worrying.
He reportedly suffered a sprain, but even a low-grade sprain will rule him out, potentially disrupting his start in 2025.