Ntouba arrived in South Africa a few weeks ago to try his luck with Bidvest Wits.
However, the Dynamos forward has since resurfaced at United where he hopes to impress coach Eric Tinkler.
Ntouba's manager Mike Ngobeni confirmed his client is at Matsatsantsa.
"I will prefer not talk about the situation at Wits," says Ngobeni.
"He is currently training with SuperSport United, having started last week Friday."
Tinkler is short of frontline options following the sale of Jeremy Brockie to Mamelodi Sundowns and injuries to Bradley Grobler and Thabo Mnyamane.
Zimbabwean hitman Kingston Nkhatha is currently leading the line for the struggling Tshwane giants, who lost 4-1 at home to Wits on the weekend.
Tinkler will hope new signing Mogakolodi Ngele can make a difference in the final third following the Botswana international's arrival from Sundowns.