Growing up in Fukuoka, a prefecture on the Japanese island of Kyushu, a young Tomiyasu, known affectionately as 'Tomi', wanted to emulate his sisters in joining a swimming school.
At the age of six, as revealed by , Tomi was all set to take up swimming as his primary passion - before a chance encounter changed everything.
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The youngster was playing in the hallway of his apartment, when teacher Kanji Tsuji came over to visit his parents.
Tsuji, also general manager of an elementary school's football set-up, was blown away by Tomiyasu's speed, and was convinced that he should try his hand at the beautiful game.
Recalling the meeting, he said: "When he dribbled, probably no one in Fukuoka had a leg to catch up with him. He was horribly fast."
Upon Tsuji's recommendation, Tomiyasu's parents enrolled him in Mitsuzuki Kickers' school programme, which he took to like a duck to water.
With dreams of swimming ditched, Tomi became obsessed with football, with Tsuji adding that he was always 'earliest to practice'.
He had a new dream to devote himself to now, being a professional footballer.
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BARC TO THE DRAWING BOARD
At the age of 11, upon the recommendation of his coach, Tomiyasu attended a trial at a Barcelona Soccer Camp in Japan.
And such was the impression that he made, that the LaLiga kings offered him a place in their academy.
The decision was much to agonise over, but ultimately moving 9,000 miles to a different continent proved to be too much to ask of a boy so young.
Tomiyasu turned down the offer, but his opportunity to move to Europe would come around again.
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in 2019: "The environment is completely different from the team I belong to. The level is high and it was very inspiring."
At 11, he signed for his local J2 League side Avispa Fukuoka, and began his ascent through the ranks, eventually debuting for the first team aged 16 in October 2015.
After spending the 2016 season in and out of the side, Tomiyasu became a regular the following season, attracting attention from Europe once again.