Neymar will have surgery after rupturing his ACL and suffering a meniscus tear in his left knee, Al-Hilal have confirmed.
The Brazil star suffered the horrifying injury while playing in his nation's 2-0 defeat to Uruguay in World Cup qualifying on Tuesday evening.
He could miss the rest of the season and it leaves him facing a race against time to recover ahead of the Copa America in the United States next summer.
Al-Hilal posted on X, formerly called Twitter: 'The medical tests Neymar underwent confirmed the Anterior Cruciate Ligament and Meniscus tear injury in his knee. He will be going through surgery and then a treatment program that will be determined later.'
Neymar only signed his £130million-per-season contract with the Saudi Arabian club a couple of months ago.
Neymar knew something was wrong as soon as he went down.
He collapsed after competing for the ball with Nicolas de la Cruz in the 44th minute, holding his left leg in pain and calling for medical attention as his team-mates looked on anxiously.
The 31-year-old was taken off via a stretcher on wheels at half-time in clear agony and was pictured with a leg brace after the game.
Now his worst fears have been confirmed.
This year has already been a difficult one for Neymar with regards to injuries.
His final season at PSG was blighted by a right ankle injury in February which required surgery and meant that he played no more games for the French giants.
Neymar's last game at PSG was the 4-3 win over Lille in February, during which he had to be stretchered off due to the injury.
This summer, he completed a £78m move to Al-Hilal and was welcomed by a grand ceremony.
Around 60,000 fans welcomed the Brazilian in a show with fireworks, flashing lights, and words emblazoned
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