Alexander Isak was subjected to racist abuse as Sweden booked their spot at Euro 2020 with a 2-0 win over Romania on Friday.
Isak, 20, came off the bench during the win in Bucharest, with the game halted shortly after his 78th-minute introduction because of comments in the Swede's direction.
While play was then allowed to continue, the Real Sociedad forward confirmed he had reported racist abuse to the referee, describing the incident as "incredibly sad".
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The young attacker was also booed loudly by the crowd every time he touched the ball as the fans responded to the match being halted.