Amakhosi on Friday announced the signing of left-back Mirwa, who caught their attention with his performances in the ABC Motsepe League last season.
The 23-year-old Mamelodi Sundowns development product helped the North West side reach the play-offs where they fell short in their bid for promotion to the National First Division.
"First time I saw that boy playing I was asking myself how did Downs let that talent go," Thomo tells KickOff.com.
"I trust that boy he will do very well, he have everything. Very good player, lots of energy, very strong with a good technique.
"He was in the development of Downs, then to University of North West at Mafikeng after he joined Orbit College. Then last season he moved to Buya Msuthu."
Thomo has warned PSL defenders to watch themselves when they go into a tackle with his former teammate as he takes no prisoners.
"Up and down, lots of energy. Everyone in the team knows when he comes you must pull out, just run away. That guy will take you to hospital. The coaches always beg him to be easy but he don't know how to do that, he is an animal," concludes the former Baroka and Magesi defender.