2007-08: Laurent Brossoit was chosen in the second round, 26th overall, of the 2008 WHL Bantam Draft by the Edmonton Oil Kings.
2008-09: Brossoit played in 20 games for the Valley West Hawks of the BCMML. Bossoit saw his first WHL action with the Oil Kings, playing in 1 game for that team.
2009-10: Brossoit spent most of the season with the Cowichan Valley Capitals of the BCHL. In 21 games, Brossoit registered a 3.66 goals-against average, a .901 save percentage, and a 10-8-0 record. In 5 playoff games, Brossoit registered a 3.93 goals-against average and a .911 save percentage. Brossoit played in 2 games for the Oil Kings, posting a 2.80 goals-against average and a .944 save percentage. Brossoit played for Team Pacific at the 2010 World U-17 Hockey Challenge, posting a 2.00 goals-against average and a .902 save percentage in 2 games.
2010-11: In his WHL rookie season, Brossoit played in 34 games for the Oil Kings. He registered a 3.32 goals-against average and a .887 save percentage. In 2 playoff games, Brossoit posted a 3.58 goals-against average, a .875 save percentage, and a 13-12-2 record. Brossoit was chosen in the sixth round, 164th overall, of the 2011 NHL Draft by the Calgary Flames.
2011-12: Brossoit was a workhorse for WHL champion Edmonton in his second season with the Oil Kings. He had a record of 42-13-5 with 3 shutouts in 61 games and posted a 2.47 goals against and .914 save percentage. The Oilers finished with the WHL's best record in winning the Central Division and rolled through the playoffs. Brossoit was 16-4 with 2 shutouts and had a 2.04 goals against and .933 save percentage. He started all four games at the Memorial Cup and was 1-3 with a 4.04 goals against and .871 save percentage.
2012-13: Broissoit returned to Edmonton for a third season; back stopping the Oil Kings to the WHL Finals. A late cut for Canada's U20 squad which would finish fourth in the World Junior Championship, Brossoit took his game to another level after returning to Edmonton. In 49 regular season games he was 33-8-6 with 5 shutouts and had a career-best 2.25 goals against and .917 save percentage. The Oil King finished first in the Central Division and reached the WHL Finals against U.S. Division champion Portland. Brossoit played all 22 playoff games and was 14-8 with 5 shutouts; finishing with a 1.82 goals against and .935 save percentage. He signed a three-year entry-level contract with Calgary in April, 2013.
Brossoit is a strong, athletic, and agile goaltender who has a long reach and can extend his large frame to fill the upper section of the net. The butterfly goalie can be at times brilliant and get on a hot streak but is prone to letting in a weak goal on a harmless-looking shot when he's fighting his game. His biggest weakness is that he can be susceptible to letting in soft goals and losing his mental focus. If Brossoit can put all of his physical tools together and get stronger mentally as he matures then the talent goalie could become a dominant NHL goaltender. The risk with the raw netminder is whether he can overcome his mental consistency issue to play goal at the pro level. His boom or bust potential makes him an excellent sleeper pick for the Calgary Flames.
Brossoit was dealt along with Roman Horak to the Edmonton Oilers in exchange for Olivier Roy and Ladislav Smid.