[2] Transferring midseason to youth side Stella Azzurra Roma, he participated in the Euroleague Next Generation Tournament with the team, finishing as top scorer of the Rome leg with 20.5 points per game, in addition to 5.3 rebounds.

On 25 April, Siliņš top-scored for Reggio Emilia with 14 points to help then get past Royal Halı Gaziantep in the EuroChallenge semi-final,[6] as the side went on to win the competition.

[11] After being hampered by injuries during the first part of the 2014–15 season, he profited from being repositioned at his natural small forward position, performing well in the title playoffs as the team reached the finals.

[13] In July 2017 OJ was the first summer acquisition of Aquila Basket Trento, signing a one-year-contract with the team and returning to ULEB Eurocup.

[16] On December 4, 2019, he signed with Brescia Leonessa of the Italian Lega Basket Serie A (LBA) a two month contract with an option to extend it until the end of the season as replacement for the injured Ken Horton.

[19] There he made his VTB United League debut and stood out with a couple of stellar performances against then Euroleague team BC Khimki.

[21] After two great seasons with BM Stal, on July 9 2024, Silins signed on to play for another ambitious Polish team Legia Warsaw.

In 2016, Silins finally made a debut in Senior National Team and took a part in 2016 FIBA World Olympic Qualifying Tournaments for Men, averaging 7.7 points, 4.3 rebounds, 1.3 steals and 1.0 blockshots per game.

[26] He's an athletic combo forward with a good physique, in addition to a decent three point shot, ability to drive-and-kick and post-up smaller opponents.