Standing 213 cm tall, Jayce Johnson arrives in Ljubljana following a successful season in Türkiye with Manisa, where he averaged 9.1 points and 7.5 rebounds over 30 appearances. The American big man began his collegiate career at the University of Utah before transferring to Marquette University, where he completed his NCAA career. Since turning professional, he has gained experience in Romania, Italy, the NBA G League, and most recently Türkiye.

Johnson began his professional career in Romania with CSU Sibiu, averaging 9.1 points and 9.1 rebounds in 21 games while also making his debut in the FIBA Europe Cup. He then returned to the United States, spending the 2022/23 season with the Santa Cruz Warriors before joining the Motor City Cruise for the 2023/24 campaign. Notably, Johnson led the entire NBA G League in rebounding during the 2022/23 season, averaging 13.5 rebounds per game. Ahead of the 2024/25 season, he signed with Pallacanestro Trieste, where he averaged 9.3 points and 7.0 rebounds across 29 games in Italy’s top division, before moving to Manisa for the 2025/26 season.

Johnson has also represented the United States senior national team. He appeared in two FIBA AmeriCup 2025 Qualifiers, averaging 8.5 points and 10.0 rebounds per game.