After Lionel Messi, Mbappe is arguably the biggest star in FIFA Club World Cup. Gastroenteritis is also known as stomach flu and symptoms can include vomiting and diarrhea.

Mbappé was initially reported to have a fever, missing Real Madrid’s opening match of the Club World Cup in Miami on Wednesday, June 18, according to the Associated Press.

He did not practice Tuesday and did not play Wednesday in Real Madrid’s 1-1 draw against Al-Hilal in the FIFA Club World Cup at Hard Rock Stadium in Miami.

Real Madrid will play Juventus in their Club World Cup round-of-16 match at Miami’s Hard Rock Stadium at 3 p.m. ET on Tuesday, July 1. Mbappé has missed all three of Real Madrid’s matches in ...

World Cup winner Mbappe missed the Spanish giant's opening game of the tournament on Wednesday — a surprise 1-1 draw against Saudi Arabian team Al Hilal in Miami — because of a fever.

Real Madrid's Kylian Mbappe, left, and Juventus' Daniele Rugani challenge for the ball during the Club World Cup round of 16 soccer match between Real Madrid and Juventus in Miami Gardens, Fla ...

The Real Madrid forward could make his Club World Cup debut Tuesday against Juventus in the round of 16 after being listed among coach Xabi Alonso’s substitutes when lineups were released.