Real Madrid's Kylian Mbappe celebrates scoring his side's 3rd goal during the Club World Cup quarterfinal soccer match between Real Madrid and Borussia Dortmund in East Rutherford, N.J. (AP)

NEW JERSEY, July 7:  Real Madrid's Kylian Mbappé found himself alone at MetLife Stadium on Saturday night after his team departed for the airport without him following a 3-2 win over Borussia Dortmund in the Club World Cup quarterfinals in the United States.

Mbappé, who scored his first goal of the tournament during the victory, remained behind after being selected for a mandatory doping test. While the rest of the Real Madrid squad boarded the team bus en route to West Palm Beach, Miami, the French star was delayed on the field for nearly an hour.

Sources close to the team revealed that Mbappé had difficulty providing a sample due to dehydration, compounded by the intense heat and a recent recovery from a stomach and intestinal illness.

Nearly an hour after the team’s departure, Mbappé finally exited the stadium. He left in a black vehicle, accompanied by a club official and escorted by five police cars, to catch up with the team at the airport.

Mbappé had missed Real Madrid’s first three matches in the Club World Cup. He returned to action as a substitute in the round of 16 match against Juventus, and again in the quarterfinal showdown with Dortmund.