Mbappe Hospitalized, Missing Real Madrid's Club World Cup Opener

Kylian Mbappe, a star soccer player, was supposed to play in a big game for Real Madrid.

But, he wasn't feeling well and had to miss the game.

At first, it was thought he just had a fever.

Later, the team said he had a stomach problem called acute gastroenteritis.

Because of this, he had to go to the hospital for tests and treatment.

It is unknown when he will be back in the game.