2009-10: Jeremy Gregoire played in Quebec's midget AAA league as a 14-year-old. In 28 games for the Magog Cantoniers he scored 4 goals with 8 assists and had 22 penalty minutes. Gregoire scored 3 goals with 1 assist and had 6 penalty minutes in ten provincial playoff games.
2010-11: Gregoire had 53 points in 38 games as an assistant captain for Magog in his second season and represented Quebec in the 2011 U17 World Hockey Challenge and Canada Winter Games tournaments. He scored 28 goals with 25 assists and had 42 penalty minutes in the regular season. Magog reached the provincial semifinals and Gregoire scored 8 goals with 8 assists and had 10 penalty minutes in 13 playoff games. He had 1 assist with 12 penalty minutes in six games for silver medal-winning Canada Quebec at the WHC and scored 5 goals with 1 assist in six games for Team Quebec at the Canada Winter Games. Gregoire was selected by Chicoutimi in the first round (sixth overall) of the 2011 QMJHL Entry Draft and by Indiana in the fourth round (50th overall) of the 2011 USHL Futures Draft.
2011-12: Gregoire made the jump from midget to major junior – skating in 61 games for Chicoutimi in his first season – and represented Canada Quebec in the 2012 U17 World Hockey Challenge. He scored 15 goals with 15 assists and was -6 with 59 penalty minutes for the Sangueneens. Chicoutimi, after finishing fifth in the East Division, reached the QMJHL playoff semifinals. Gregoire scored 2 goals with 4 assists and was -3 with 14 penalty minutes in 18 playoff games. He scored 1 goal with 3 assists and had 2 penalty minutes in five games for Canada Quebec at the WHC.
2012-13: Gregoire returned to Chicoutimi after winning a gold medal with Canada's squad at the 2012 Ivan Hlinka Memorial Tournament and began the year with the Sangueneens before a mid-season trade to Baie-Comeau. He appeared in 35 games for Chicoutimi, scoring 7 goals with 8 assists and was -10 with 71 penalty minutes before the trade. In 27 regular season games for the Drakkar he scored 12 goals with 5 assists and was +1 with 29 penalty minutes. After finishing first in the East Division, Baie-Comeau advanced to the QMJHL finals against eventual Memorial Cup champion Halifax. Gregoire scored 9 goals with 7 assists and was +3 with 27 penalty minutes in 18 playoff games. He was scoreless with 4 penalty minutes in five games for Canada at the Ivan Hlinka tournament. Gregoire was ranked 79th amongst North American skaters in Central Scouting's final rankings prior to the 2013 NHL Draft.
A hard-nosed, two-way player, Gregoire works hard on the ice and is always willing to mix it up. Although he will never be confused for a speedster or an offensive talent, Gregoire is a character player who does the little things well and always leaves it all out on the ice. Willing to stand up for his teammates and help create room on the ice, Gregoire's all weather game and good size cannot be appreciated enough.
Gregoire has a few more seasons in the QJMHL before getting the opportunity to turn pro. The two-way centerman will need to work on his skating stride, edge work and acceleration in order to play at the next levels. His defensive game is strong enough but he will need to improve his overall offensive skills. The long shot prospect has bottom-six potential in the NHL if everything goes well with his development over the next few years.