Audentes (2015–2016)

In September 2015, Drell joined his hometown team Audentes/Noortekoondis.^[7]

Brose Bamberg (2016–2019)

On 1 July 2016, Drell signed a six-year contract with German club Brose Bamberg.^[8] He made his professional debut for Brose Bamberg on 18 March 2019, recording 2 points in a 100–74 win over Eisbären Bremerhaven.^[9]

Drell mainly played with Baunach Young Pikes, the farm team of Brose Bamberg, in the German 2nd Division (ProA). In the 2018–19 season Drell's stats of 13.1 points, 3.9 rebounds and 1.6 assists per game for Baunach showed marked improvement over the previous year, playing in the ProA.^[10] On 2 February 2019 he was named the ProA Youngster of the Month. Drell eventually finished second in Pro A Young Player of the Year voting.^[11]

On 19 April 2019, he declared for the 2019 NBA draft. ESPN ranked Drell 55th out of 100 draft prospects, but later on he decided to withdraw from the draft in order to try to improve his draft stock for the 2020 NBA draft.^[12]

Victoria Libertas Pesaro (2019–2021)

On 19 July 2019, Drell signed with Italy's Victoria Libertas Pesaro of the Lega Basket Serie A.^[13] He made his professional debut for VL Pesaro on 22 September 2019, recording two points and three rebounds in 25 minutes and a 72–80 loss over Fortitudo Bologna. However, the season ended prematurely because of the COVID-19 pandemic.^[14]

In his second season with Victoria Libertas Pesaro under coach Jasmin Repeša, Drell played 24 games and started in 12, while averaging 16.6 minutes per game and making huge improvements throughout the season, mainly in defence and shooting.^[15] He finished the season shooting 40% from the three-point line and 50% from two-point range.^[16] On 12 January, Drell helped VL Pesaro to qualify for the Italian Basketball Cup after a ten-year drought.^[17]

In February 2021, in a prestigious Italian Basketball Cup, Drell had a break-out tournament, where in the quarter-finals he recorded his LBA career-high 23 points, shooting 7-of-9 from the field, with five rebounds in an overtime 115–110 win over Dinamo Sassari.^[18]^[19] Drell helped his team to reach their seventh Italian Cup finals, beating Happy Casa Brindisi in the semi-finals, but eventually losing to AX Armani Exchange Milano in the final, where he posted 12 points and four rebounds in 23 minutes.^[20]^[21] Drell was named "Best Offensive Player" in the tournament. He finished the tournament averaging 12.7 points, 3.3 rebounds, 1 assist per game, Drell had also the best shooting percentages in the tournament: 63.6% from the two-point range and 62.5% from the three-point range.^[22]^[23]^[24] He parted ways with the team on 30 November 2021.^[25]

Windy City Bulls (2022–2023)

On 15 January 2022, NBA Draft-eligible Drell was acquired from the available player pool by the Windy City Bulls of the NBA G League.^[26]

In April 2022, Drell made history for the Windy City Bulls, becoming tenth in all-time blocks in franchise history, despite playing only 17.3 minutes per game over 29 games in the season.^[27]^[28]

After going undrafted in the 2022 NBA draft, he signed an NBA Summer League contract with the Chicago Bulls.^[29]^[30]

On 12 October 2022, the Chicago Bulls signed Drell to an Exhibit-10 contract and immediately waived him on the same day.^[31] He later re-signed with the Windy City Bulls and ended the season averaging 11.6 points, 6 rebounds, and 2.5 assists per game.^[32]

Chorale Roanne Basket (France) (2023)

On 9 April 2023, Drell returned to Europe, signing for the remainder of the season with French club Chorale Roanne Basket of the LNB Pro A.^[33]

Chicago / Windy City Bulls (2023–2024)

On 12 September 2023, Drell signed with the Chicago Bulls,^[34] but was waived on 12 October.^[35] On 2 November, Drell rejoined the Windy City Bulls.^[36] On 16 December, Drell signed a two-way contract with Chicago.^[37] Drell made his NBA debut on 14 March against Los Angeles Clippers, scoring 2 points and dishing out 2 assists.^[38] He became the second Estonian player to ever play in the NBA after Martin Müürsepp, who debuted with Miami Heat in 1996.^[39]

Rip City Remix (2024–present)

On 13 August 2024, Drell signed with the Portland Trail Blazers,^[40] but was waived on 27 September.^[41] On 28 October, he joined the Rip City Remix.^[42]

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