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.
It is really special. I had a lot of friends and family here tonight, and for my first [NHL] game in here it was great. I played here as an elementary-school player in the city championships and this was my first time back. It was a lot of fun.
— Toronto native Brandon Pirri after scoring 2 goals for Panthers in win at Maple Leafs on Thursday