Ajax has to do without Mohammed Kudus for months.
The midfielder suffered damage to his meniscus in the Champions League match against Liverpool on Wednesday.
Kudus, who played a role as a false striker against Liverpool, had to be replaced soon.
He got injured after trying to win a ball.
The twenty-year-old Ghanaian is new at Ajax this season.
He was taken over for 9 million euros from the Danish FC Nordsjaelland.