It marks a return to the Soweto giants for the 23-year-old Mabuza, who previously played for the club’s Diski Challenge team before leaving for M Tigers, Lerumo Lions and Gallants.
His arrival sees Daniel Msendami and Abdoulaye Mariko move in the opposite direction on season-long loans.
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“During his time away from the club, Mabuza made encouraging progress and impressed. His performances at Gallants convinced the club that he is ready to return and take the next step in his career,” Pirates said in a statement.
Mabuza made 32 appearances for Gallants last season, scoring three goals and providing one assist.