Before starting his professional career, Grigonis played in the NKL with the Žalgiris-Arvydas Sabonis school for four seasons. He was an important contributor to the team during his debut season, and established himself as a leader by his third season. He won bronze medals during his last two seasons with the Sabonis school team.
On 13 July 2017, he signed a three-year deal with German club Alba Berlin.[4]
Return to Žalgiris (2018–2021)
On 3 July 2018, Grigonis returned to Žalgiris Kaunas when he signed a three-year contract.[5] His season was cut short due to an injury in November 2019. Grigonis averaged 11.5 points, 2.6 rebounds and 2.0 assists per game in the first 10 games of the 2019–20 season. On 8 July 2020, he re-signed with the team.[6]
CSKA Moscow (2021–2022)
On 12 June 2021, Grigonis signed a three-year contract with VTB United League champions and EuroLeague mainstays CSKA Moscow. He averaged 8.5 points, 1.4 rebounds and 1.9 assists per game during his first season the Russian powerhouse.
Grigonis received an improved role in the team rotation during his second season, under the supervision of new head coach Ergin Ataman. On 8 April 2024, Grigonis agreed upon a three-year contract extension that would keep him with the Greek powerhouse through 2027.[12] On July 11 of the same year, the deal was made official. [13]
National team career
Grigonis represented Lithuania in the U–16, U–18, U–19 and U–20 youth tournaments. He led his team to two silver medals and a bronze medal while participating in four tournaments. During the 2012 FIBA Europe Under-18 Championship semifinal game, he scored the winning shot against Serbia. As a result of his contributions to the team's success, he was chosen to be included in the All–Tournament Team.[14] In 2014, coach Jonas Kazlauskas included Grigonis in the preliminary 24–player candidate list for the senior national basketball team.[15] Though, he was invited to the national team training camp for the first time only in 2016 and immediately qualified into the Olympic roster.[16][17]