St-Denis, 28, spent last season with the Blue Jackets' American Hockey League affiliate in Springfield, where he scored nine goals and 26 points in 60 games. The Quebec native started his NHL career with the Montreal Canadiens organization in 2008-09 before signing with Columbus as a free agent in 2013.
In 17 games with Montreal during the 2011-12 season, St-Denis scored one goal and three points with 10 penalty minutes and a plus-3 rating.
[He's] real confident with the puck now, getting it off his stick quick and no second-guessing. We need that. He's such a good guy in the room. He works so hard. That's the big thing. For not a big man, he just fights for every puck and when he scores, the guys appreciate that even more.
— Winnipeg Jets coach Paul Maurice on Mathieu Perreault, who scored two goals in win against Chicago Blackhawks on Tuesday