He earned 5 caps at international level between 1937 and 1941, scoring 2 goals.
At club level Sundelin played for TPS. He scorer 30 goals in 1960 Mestaruussarja season, which is still the record of top-tier football in Finland. In the same season he scored 7 goals against IF Drott, which is still the record of goals scored in a one match of top-tier football in Finland.
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