Klintman was born in Malmö, Sweden, to a Swedish mother and a father from Senegal.[1][2] He attended Sweden's RIG Mark Academy in Kinna.[3] In the 2019–20 season, he played 13 games for RIG Mark in the third-tier Basketettan.[4] He continued with RIG Mark in the second-tier Superettan in 2020–21 before the season was cancelled in February 2021 due to the COVID-19 pandemic.[5] He played six games for Borås Basket in the first-tier Basketligan to finish the season.[4]
Klintman enrolled at Sunrise Christian Academy in Bel Aire, Kansas, for the 2021–22 U.S. high school year.[6] He was rated a four-star recruit and initially committed to playing college basketball for Maryland.[7] He later decommitted from Maryland and committed to play for Colorado.[8] Klintman decommitted a second time and ultimately signed to play for Wake Forest.[9]
College career
As a freshman in the 2022–23 season, Klintman played in 33 games with five starts and averaged 5.3 points and 4.5 rebounds in 20.5 minutes per game for the Wake Forest Demon Deacons.[10]
Klintman initially declared for the 2023 NBA draft[11][12] and later informed Wake Forest that he would not return to the team for the 2023–24 season.[13]