He most notably played in the National Hockey League (NHL) with the Colorado Avalanche, San Jose Sharks, Calgary Flames and Winnipeg Jets.

Leading the Avalanche forwards on the penalty kill he posted a team high 4 short-handed points, the most by any Colorado player since Peter Forsberg and Joe Sakic in 2000–01.

[10] Due to injury, Galiardi also found a role on the Avalanche top scoring line with Paul Stastny and Chris Stewart and posted a career high four assists in a 5–1 victory over the Columbus Blue Jackets on February 2, 2010.

[11] TJ made his playoff debut and in 6 games posted 2 assists as one of the Avalanche's most notable players in the Western Conference Quarterfinals defeat to the San Jose Sharks.

As a restricted free agent at season end, Galiardi initially opted to take the Sharks to salary arbitration before agreeing to a one-year extension on July 9, 2012.

[17] With the 2012 NHL lockout in effect and in order to keep in shape, Galiardi signed his first European contract with German second division club, SC Bietigheim Steelers on October 3, 2012.

[18] Galiardi appeared in 7 games, posting 6 points with Bietigheim before suffering a minor knee injury, which forced a return to North America for rehabilitation.

[20] At the conclusion of the lockout and return to health, Galiardi struggled initially as a healthy scratch for the Sharks before securing a regular role on the team by the playoffs, to finish with 14 points in 36 games.

As an impending free-agent, Galiardi left the Jets and the NHL in signing a one-year contract with Swedish club Malmö Redhawks of the SHL on June 9, 2015.

[27] In the 2016–17 season, Galiardi had an instant impact offensively, adding 4 goals and 7 points in 8 games in Zagreb before he was traded for financial compensation to the Russian KHL team HC Neftekhimik Nizhnekamsk, on December 23, 2016.

As a free agent in the off-season, Galiardi opted to continue his tenure in the KHL, agreeing to a one-year deal with Dinamo Riga, on July 27, 2017.

[30] Galiardi effectively announced his retirement from professional hockey after 10 seasons, in becoming a co-founder and Chief Marketing Officer in a sports nutrition company specifically catering to Vegans.