Isak, 20, came off the bench during the win in Bucharest, with the game halted shortly after his 78th-minute introduction.

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".

"Of course it is sad for the moment, but at the same time we were prepared for such things to happen, even if it does not help in that way," Isak said.

"I think I could handle it well and the team's support was incredible too.

"We did well and it is incredibly sad that such things happen, but what should we do?"

With one game remaining, Sweden (18 points) is second to Spain (23) in Group F, with both sides having already progressed.

Finland was the other team to book its spot at UEFA Euro 2020 on Saturday (AEDT) after a 3-0 victory over Liechtenstein, reaching its first major tournament.

Denmark and Switzerland moved closer to qualifying from Group D after wins over Gibraltar and Georgia respectively.

With 15 points, Denmark tops the group ahead of Switzerland (14) and Republic of Ireland (12), with all three teams having one game left to play.