Troisi, who had a number of options including an offer from Adelaide United, was keen to continue his career back in Europe after completing last season's successful 35-game, 15-goal loan stint at Melbourne Victory from Serie A champion Juventus.
When the formal offer came from the side placed 12th on the Belgium league ladder, Troisi had no hesitation in commiting himself on Saturday (AEST) to a club where he is likley to command first team football in the build up to January's AFC Asian Cup on home turf.
Brokered by former Socceroos midfielder turned player agent Vince Grella and Belgium-based agent Federico Avellino, the deal was completed just three days before the closure of the transfer window.
Troisi, 26, will now join Socceroos goalkeeper Mat Ryan, who is flourishing at Club Brugge, in a country that former Socceroos Archie Thompson, Paul Okon and Frank Farina also once called home.
Troisi has been in Turin with his parent club Juventus honing his fitness since being summoned back from Australia two weeks ago.
While he may be short of match sharpness, he plans to impress new mentor Francky Dury by quickly catching up to his teammates.
Signed by Juventus from Turkish Super Lig Kayserispor in 2012, Troisi never made a senior appearance for the Old Lady, though he did play six games for fellow Seria A side Atalanta as part of their shared ownership of his four-year contract.
His eye-catching A-League season brought the reward of a Socceroos FIFA World Cup call up where he came off the bench against Chile and Spain.
Troisi will be looking to quickly settle at a side which won the Belgian Cup in 2006 and was fourth in the league last season, having finished runner up the previous year.