Masuku joined Celtic on a two-year deal last week from Chippa United, having spent two-and-a-half years with the Chilli Boys after a spell with Orlando Pirates.
The midfielder made eight appearances for Chippa this season, and will hope to make his Phunya Sele Sele debut against Maritzburg United at Harry Gwala Stadium on Friday (20h00).
"I am very excited about the move. We all know that the team has exceptional supporters and my decision to come was influenced by the fact that I will be appreciated by both management and most importantly the exciting supporters,” Masuku told the club's website.
“I am here to revive my career and blossom in a team that plays the style of football that suites me perfectly. The warm welcome that I received since my arrival proves the kind of unity and comradeship one has to align himself with. There are a lot of great players here and it’s a great feeling to immediately feel at home.”