Kalev/Cramo (2016–2017) On September 10, 2016, Tollefsen started his professional career with the Estonian team
Kalev/Cramo, signing a one-year deal. On January 31, 2017, Tollefsen recorded a season-high 29 points, shooting 12-of-19 from the field, along with eight rebounds and three blocks in an 88–64 blowout win over
Tallinna Kalev. On February 16, 2017, Tollefsen participated in the
Estonian League All-Star Game. Tollefsen helped Kalev/Cramo to win the
2017 Estonian Cup and the
2017 Estonian League Championship.
Maccabi Rishon LeZion (2017–2018) On August 20, 2017, Tollefsen signed with the Israeli team
Maccabi Rishon LeZion for the 2017–18 season. On December 18, 2017, Tollefsen recorded a season-high 23 points, shooting 8-of-12 from the field, along with 12 rebounds, 6 assists and 5 steals in a 93–80 win over
Bnei Herzliya.
Maccabi Ashdod (2018–2019) On August 1, 2018, Tollefsen signed a one-year deal with
Maccabi Ashdod. On January 24, 2019, Tollefsen recorded a double-double with a career-high 31 points and 10 rebounds, shooting 7-of-16 from the three-point range, along with two assists in a 100–104 overtime loss to
Maccabi Tel Aviv. On May 6, 2019, Tollefsen recorded 27 points, shooting 6-of-10 from the three-point range, along with nine rebounds, leading Ashdod to a 101–92 win over
Ironi Nes Ziona. He was subsequently named
Israeli League Round 30 MVP. Tollefsen finished the season as the
league top scorer with 20.4 points, along with 5.5 rebounds and 1.1 assists per game, while shooting 44.3 percent from three-point range.
Return to Ashdod (2020–present) On February 8, 2020, Tollefsen returned to
Maccabi Ashdod for a second stint, signing for the rest of the season. ==Career statistics==