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Jim Brennan of Toronto FC retired on Wednesday. ((Nathan Denette/Canadian Press))

Jim Brennan has called it a day after a 15-year playing career.

The Toronto FC captain and veteran defender officially announced his retirement Wednesday to take up a position as assistant general manager with the Reds where he will work under Mo Johnston.

Brennan, who turns 33 next month, became the first player to join Toronto FC when he signed with the Canadian club prior to its inaugural Major League Soccer season in 2007.

Before that, Brennan spent 10 years in England with a handful of clubs, including Bristol City, Nottingham Forrest, Norwich City and Southampton.

As a player who returned home to play for his hometown team, Brennan became the poster-boy for the franchise, his face adorning billboards and public advertisements in the buildup to the team’s league debut.

Noted for playing when he was injured, Brennan ended up scoring four goals in 84 games during his three seasons with TFC. He also represented his team at the 2008 MLS All-Star Game held in Toronto, and was named the club's co-MVP in 2007.

The timing of the retirement announcement is a bit of surprise.

Brennan signed a new deal in the off-season, participated in a two-month training camp and started at his left-back position in Toronto's season-opening 2-0 loss to the Columbus Crew on March 27.

Brennan stated previously that it was his intention to play out the 2010 MLS campaign before walking away from the game, but a source told CBCSports.ca that Brennan, who played in close to 50 games for the Canadian national team, had expressed interest in a management position with the team after his playing career was over.