This was confirmed via a tweet by the press officer at his English Championship club, Peterborough United, and then retweeted by the player himself.
"Can now confirm that Kgosi Nthle has been called up to the South African senior squad for games against Brazil and Mozambique,” United press officer Phil Adlam said.
The 18-year-old left-back broke into the first team at Peterborough in the final two Championship games of last season, both substitute appearances.
However, he has started all the club's games so far in the current campaign and looks to be entrenched in the fullback position.
He is known to be highly rated by United manager Darren Ferguson, son of Manchester United legend Sir Alex.
Ntlhe played for the South African Under-20 side at the 8-Nations Tournament in Cape Town earlier this year and won rave reviews for his performances.
Should he make it onto the pitch in either game, he will be four months older than the youngest-ever Bafana international, Aaron Mokoena, who was 18 years, two months and 26 days when he played against Botswana in 1999.
Igesund is only due to formally announce his squad for the two matches on Thursday.