Masuku, 32, penned a short-term contract with the National First Division side today, according to club spokesperson Livhuwani Madzuhe.
"Yes, we have signed him today," Madzuhe tells KickOff.com.
"We've finalised the registration today, we've received the card and everything. So we were still negotiating with him because obviously it can't be a long-term contract. We gave him a six-months contract with an option to renew.
"He will be part of the team flying to Cape Town. He started training with the team yesterday. We need to beef up our team because we can now see that we are competing. We wanted an experienced player who can come and beef up our team. He is the person who can add value to our team. Even our coach was happy with his first training session with the team yesterday."
Masuku, who left Celtic in the new year, trained with Bidvest Wits and NFD leaders Highlands Park before finalising terms with TTM.
Sello Chokoe's side are second in the league standings with 10 games left, and next visit 10th-placed Cape Town All Stars at Parow Park on Friday (15h30).