T. J. Brennan

During his fourth year within the Flyers organization with the Lehigh Valley Phantoms in the 2019–20 season, Brennan was unable to match his previous career scoring output, recording just 8 points through 28 games, before suffering an injury. On February 24, 2020, Brennan was traded at the NHL trade deadline by the Flyers to the Chicago Blackhawks in exchange for Nathan Noel. He was immediately assigned to join the Rockford IceHogs of the AHL.

On July 5, 2016, Brennan signed a two-year contract with his hometown Philadelphia Flyers.

On February 26, 2015, Brennan was traded to the Toronto Maple Leafs in exchange for Spencer Abbott. He was then reassigned for a second stint with the Marlies. During this season, he would also make his first appearance for the Maple Leafs, playing in 6 games for the club. Brennan was re-signed to a one-year contract following the seasons completion. The following year, Brennan was a staple defenseman on the league leading Marlies, remaining at a point a game throughout the season and recording the second most points in the AHL. Brennan was called up to play in one game on March 9, 2016 due to an influx of injuries. However, a few weeks later, on March 31, with few games remaining in the season, Brennan was called up to the Maple Leafs to finish the year, in reward for his strong minor league play. On April 4, Brennan scored his first goal in the NHL in nearly 3 years, potting one in a 4-3 defeat of the Florida Panthers. Coincidentally, Brennan's last goal was on April 11, 2013, while playing for the Panthers.

On July 4, 2014, Brennan buoyed by his successful season with the AHL's Toronto Marlies and signed as an unrestricted free agent on a one-year NHL contract with the New York Islanders. However, after partaking in the Islanders' 2014 training camp, on October 4, Brennan was traded prior to the 2014–15 season, along with Ville Pokka and Anders Nilsson, to the Chicago Blackhawks in exchange for defenseman Nick Leddy. Brennan was assigned to the Rockford IceHogs, the Blackhawks' AHL affiliate, after clearing waivers.

On March 15, 2013, Brennan was traded to the Florida Panthers in exchange for a fifth-round pick in the 2013 NHL Entry Draft.

On June 14, 2013, he was traded from the Panthers to the Nashville Predators in exchange for Bobby Butler. Brennan was not qualified by the Predators, however, and was released as a free agent on July 1. On July 5, he then signed a one-year, two-way contract with the Toronto Maple Leafs worth $600,000.

On November 23, 2011, Brennan made his NHL debut for the Sabres, also scoring his first career NHL goal against goaltender Tim Thomas of the Boston Bruins.

On April 18, 2009, Brennan signed a three-year, entry-level contract with the Buffalo Sabres that began in the 2009–10 season. Throughout the season, Brennan spent time acclimatizing to the professional level whilst with Portland, further developing his defensive game that he had begun to work on in Montreal, when his point totals dropped as he looked to become stronger as a defenseman. His work ethic also improved–Brennan quickly learned that to stay in the line-up, he would have to continue to earn his place every night, or be a healthy scratch; his hard work paid off, and he didn't miss two games back-to-back from January 12, 2010, to the end of the Pirates' post-season.

During the 2006–07 season, Brennan scored 16 goals and 25 assists in 68 games, winning the Raymond Lagacé Trophy as the QMJHL defensive rookie of the year. The following year, he played three fewer games and matched his offensive output from the year before while averaging a point per game in his team's six-game playoff run.

Terrence James Brennan (born April 3, 1989) is an American professional ice hockey defenseman currently playing for the Rockford IceHogs of the American Hockey League (AHL) while under contract to the Chicago Blackhawks of the National Hockey League (NHL), Brennan was originally selected by the Buffalo Sabres in the second round, 31st overall, of the 2007 NHL Entry Draft, and has also previously played for the Florida Panthers at the NHL level. Brennan has been cited as an elite offensive AHL defenseman, scoring at a pace of nearly a point-per-game, a rare feat for a player of his position.