Tim Johannes Barend Aloysius van Assema was born on January 31, 2002 in Assendelft, Nederländerna and made his IFK Göteborg debut in the 2019 season, which was also the debut season of team mate Giannis Anestis. van Assema was part of IFK Göteborg's youth program before making his debute with the first team, and is as a result of that regarded by the club as a home-grown player. As a result of this, he became the first player from The Netherlands to represent IFK Göteborg. At 17 years, 6 months and 20 days, on August 22, 2019, he took part his first competetive game against BK Astrio in a Svenska cupen game that ended 4–0. He has as of today spent two seasons with the IFK Göteborgs first team, and during his career he has played in 3 first team games. In the 2019/20 season he had a part in IFK Göteborg winning the Swedish Cup. van Assema is as of today, October 30, 2020, an active IFK Göteborg player. 18 year old van Assema is today, October 30, 2020, an active player for IFK Göteborg.