Ghanaian midfielder Mohammed Kudus suffered a muscle injury as Ajax beat Feyenoord 2-1 in the Dutch Cup semifinals on Wednesday night.
The 22-year-old was replaced by Francisco Conceicao in the 61st minute after going down on the playing surface.
The extent of the injury is currently unknown as there has been no update from the club.
Kudus' only goal in this competition came in the round of 16 against Twente, which saw Ajax progress to the quarterfinals.
Dusan Tadic opened the scoring in the 14th minute to shock the home fans after a fierce start to the game.
The hosts pulled level through Tomas Gimene's header from an Alireza Jahanbaksh lofted pass.
Davy Klaassen scored the winner for Ajax to see them progress to the Dutch Cup finals.
Mohammed Kudus is still yet to score since the international break, after playing 90 minutes against Go Ahead Eagles over the weekend in the Dutch Eredivisie.
He featured for Ghana in the two 2023 Africa Cup of Nations (AFCON) qualifying games against Angola.