Kylian Mbappé was sidelined from Real Madrid's Club World Cup match due to his hospitalization for acute gastroenteritis, and the superstar's return date uncertain.

His illness casts doubt over what part he might be able to play in the monthlong tournament in the United States, with Madrid facing Pachuca in Charlotte, N.C., on Sunday.

Kylian Mbappe was released from the hospital on Thursday after experiencing acute gastroenteritis, the club has announced. The French star missed Real Madrid's opener in the FIFA Club World Cup, suffering without him in Xabi Alonso's first match in charge, drawing 1-1 with Saudi Arabian side Al-Hilal.