He also earned twenty caps, scoring nineteen goals, with the Sweden national team between 1918 and 1922.

He represented his country at the 1920 Summer Olympics where he was the tournament top scorer.

When he returned to the United States, he found that his team had been sold to Charles Stoneham and renamed the New York Nationals.

Carlsson earned twenty caps, scoring nineteen goals, for Sweden.

[2] In 1920, he played for the Swedish soccer team at the 1920 Summer Olympics.