A crafty halfback who knows how to sniff out a try. His pin-point kicking game has produced many four-pointers during his first grade career at the club.

Sherwin joined Canterbury in 1997 as a goal kicking five-eight and was a regular member of the Under 19 team. He played in the Preliminary Final against Penrith.

In 1998, Brent started the season in reserve grade and became a regular member of the team playing on the wing. He broke Gary Sullivan's 1980 record for most points in a reserve grade season, scoring 170 points. Brent played in the reserve grade Premiership winning team against Parramatta. 

In 1999, Brent was a regular member of the reserve grade team as a halfback and received the opportunity to play in the NRL against Western Suburbs when Ricky Stuart was injured. He returned to reserve grade to play in the Qualifying Semi-Final against Balmain before returning to the NRL to play in the Semi-Final against Melbourne from the bench.

In 2000, Brent started the season in the NRL and became a regular member of the team as a five-eight.

In 2001, Brent was a regular member of the team, mainly playing from the bench and played in the Qualifying Semi-Final against St George from the bench. Injury prevented Brent playing in the Semi-Final.

In 2002, Brent played every NRL game that season as halfback and represented City Origin. He represented City Origin in 2002, 2003 and 2005.

In 2003, Brent was a regular member of the NRL team and played in the Preliminary Final against the Roosters.

In 2004, Brent was a regular member of the NRL team and played in the Premiership winning team against the Roosters.

In 2005, Brent was a regular member of the team but his season was cut short by a broken hand. 

In 2006, Brent started the season in the NRL but was relegated for Reni Maitua. He returned to the NRL when Ben Roberts was relegated and became a regular member of the team and played in the Preliminary Final against Brisbane.

In 2004, Brent was nominated for the Berries to Bulldogs 70 Year Team of Champions.