Boucher spent close on a decade with Smith in the South African Test side, and the pair are known to be close. They will now seek to engineer an upswing in fortunes for the Test side that has lost five matches in a row, against Sri Lanka and India.
Boucher will scramble to put together a plan to counter England in his next assignment, which starts on Boxing Day.
“Our confidence is a bit down, we need to get that back,” Boucher said.
“There is a wealth of knowledge in this country. We need to get consultants in and get information through to the players to give them the space to do their best.”
Boucher took over the domestic Titans franchise in 2016 and within a year was named coach of the year at the annual CSA awards. He has led the side to the country’s first-class four-day trophy, two 50-over competition wins and the Twenty20 title.
He made 147 Test appearances for South Africa and took 999 dismissals in all forms of cricket, a world record.
He will form part of a selection panel that also includes Nkwe, Test captain Faf du Plessis and interim selector Linda Zondi, who will be in the role until April.