Le Fondre was allowed to move on a free transfer with Bolton manager Phil Parkinson granting the forward his wish to move down under.
Bolton released the news during their live Twitter commentary during last Tuesday night's EFL cup defeat at Elland Road against Leeds United.
August 17, 2018
Le Fondre told the club's website: “This is the opportunity of a lifetime for me and I’m very much eager to get started at Sydney FC.
“I’ve heard nothing but good things about the club, they are winners with a winning culture and I’m a winner, so I believe it is the perfect match.
“My job is to score goals and I am very confident I can do that at Sydney FC, particularly with the quality players that are already in the squad.
“It’s an honour to join one of the biggest clubs in Australia and I’m confident we will continue to enjoy success.”
Le Fondre scored in Bolton's dramatic win over Nottingham Forest to escape relegation on the final game of last season.
August 17, 2018