Sangweni was released by Pirates during the current transfer period after failing to live up to expectations at Bucs.
The midfielder has since re-joined his former club, Chippa United.
“Honestly speaking, I thought Pirates would keep Thami because he is a very good midfielder,” Mokoena told Goal.
“I do not think that he was given a fair chance to prove himself because he only made a handful of appearances for the team last season,” he continued.
“I understand that injuries also hampered his progress, but I expected the club to keep him as Musa Nyatama’s back-up in central midfield,” the retired midfielder said.
“Musa deserved to play regularly because he was consistent and Thami would have provided stiff competition.
“Thami is younger and he would have learnt a lot from Musa, who is more experienced. It is rare to find a player, who goes the entire season without sustaining injuries and being suspended,” he explained.
“They needed a player like Thami ahead of a long and tough season, but I guess the club has a plan. Surely, there are players, who will provide cover to Musa in midfield,” he concluded.