Europe In the 2010–11 season, Seibutis played for
Olin Edirne Basketbol of the Turkish
Basketbol Süper Ligi (BSL), where he was one of the team's leaders, averaging 18.6 points, 3.5 rebounds, 4.5 assists and 1.6 steals per game. On 12 June 2011, Seibutis signed a three-year (2+1) contract with the Lithuanian team
Lietuvos rytas. In July 2014, he signed a contract with Turkish team
Darüşşafaka Doğuş. On 4 September 2015, Seibutis signed a one-year contract (with an option for another) with the Lithuanian club
Žalgiris Kaunas. On 21 July 2017, Seibutis signed with
Neptūnas Klaipėda for the 2017–18 season. On 17 July 2018, Seibutis signed a two-year deal with
Zaragoza of the
Liga ACB. On 11 August 2021, Seibutis officially announced his retirement from professional basketball, after having played his last game in 2019.
NBA Seibutis was drafted in the second round with the 50th overall pick of the
2007 NBA draft by the
Dallas Mavericks. Following the draft selection, he played with the Mavericks'
NBA Summer League team in
Las Vegas, averaging 6 points, 1 rebound, 1.6 assists, while shooting over 47% in 13 minutes per game over 5 games. He played again in 2008, averaging only 2 points in 10.9 minutes per game over 5 games. He was ultimately dropped from the 2008 roster because of his underperforming. On 23 July 2018, the draft rights to Seibutis, along with
Johnathan Motley, was traded to the
Los Angeles Clippers in exchange for the draft rights to
Maarty Leunen and cash considerations. On 7 August 2018, the draft rights to Seibutis, along with
Sam Dekker, were traded to the
Cleveland Cavaliers in exchange for the draft rights to
Vladimir Veremeenko. ==National team career==