The Midtjylland midfielder was the bang in Janne Andersson's squad at the beginning of November.
Since the 21-year-old also has American citizenship, it was unclear for a while which country he would choose to play for, but the choice fell on Sweden.
After playing from the start in the training international match against Denmark and sitting on the bench in the Nations League against Croatia, Cajuste was substituted in the 87th minute in the loss away against France on Tuesday.
That entry meant that the player is now definitely locked to represent Sweden in national team contexts in the future, according to the international football association Fifa's rules which say that a player is locked only when the player has participated in a competition context.
France won the match 4-2.
CLIP: Hear Cajuste about the choice between Sweden and the USA
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National team star: The talent Cajuste about the choice between Sweden and the USA