Kaliati was unveiled as a new signing by the Citizens on Friday morning. The 18-year-old midfielder is believed to have signed a five-year deal with the PSL rookies.
Mtawali promoted Kaliati from the under-20 Malawian national team and gave the youngster his first cap with the senior team national team.
"He is a brilliant youngster, a versatile and intelligent player," Mtawali tells KickOff.com.
"He played for Azam Tigers before moving to Wanderers. He was part of the under-20 team and I promoted him to the senior national team in 2016.
"He has been outstanding here at home in Malawi and deserves the move to the PSL. I have no doubt he will add value to Cape Town City and succeed in South Africa."
City will next face Chippa United in an Absa Premiership clash on Monday evening (19h30) at the Athlone Stadium.