2010-11: Teemu Lamsa appeared in one game with TuTo's U18 team and skated for the Turku club's U16 squad. He had no points or penalties in his one U18 game. Lamsa scored 15 goals with 14 assists in 14 games (including two playoff games) with the club's U16 team.
2011-12: Lamsa played for TuTo's U18 team in Division 1 hockey in Finland. He was third on the team with 11 goals and had 9 assists with 49 penalty minutes in 28 games. He also skated for the club's U16 team; scoring 4 goals with 3 assists and 4 penalty minutes in four games.
2012-13: Lamsa moved up to TPS Turku in Finland's top level of junior hockey and skated for Finland's U17 team in the 2013 World Hockey Challenge. He played in ten games for the TPS U20 team and was an assistant captain for the club's U18 squad. Lamsa had 2 assists and was +3 with 2 penalty minutes in ten U20 regular season games. He had an assist and 2 penalty minutes and was an even plus/minus in four playoff games. In 39 games with the TPS U18 team, including five playoff games, he scored 16 goals with 16 assists and had 90 penalty minutes. Lamsa led Finland with 6 goals and had 6 penalty minutes in five games at the WHC.
2013-14: Lamsa skated for Finland's U18 team in the 2013 Ivan Hlinka Memorial Tournament in August before returning to TPS for his second season with the club. In his first 30 games with TPS' U20 team he scored 8 goals with 9 assists and was +8 with 18 penalty minutes. In two games for the TPS U18 team he had 1 goal and 2 penalty minutes. Lamsa had 1 assist and was +1 with 2 penalty minutes in four games at the Ivan Hlinka Tournament. He was ranked 38th amongst European skaters in Central Scouting's mid-term rankings prior to the 2014 NHL Draft.
Only in his second season playing at the top level of Finnish junior hockey, scouts have been attracted to Lamsa's combination of size and scoring ability. While still developing in terms of tactical play and technical skills, his two-way play and willingness to play a physical style are the strong points in Lamsa's game.
Lamsa dominated the lower division in Finland before making his jump to Finland's top league during the 2012-13 season. While it is difficult to project his long-term potential, his size, determination and successful transition to a higher level of competition, suggest he can be an effective power forward with some finishing ability at the pro level.