The right-hander reached his highest singles ATP-ranking on November 11, 1991, when he became World Number 252.
N'Goran also played at the 1996 Summer Olympics in Atlanta, Georgia, in doubles with his brother Claude, and the pair reached the second round.
N'Goran played in only a handful of tour events - in singles main draws, one in 1989, six in 1991, three in 1993, and one in 1995.
He competed in two Grand Prix tennis events (the equivalent of today's ATP World Tour tourneys, upsetting Kelly Evernden and then losing to Steve Bryan in three sets at the 1991 RCA Championships and losing in the first round to Richey Reneberg at the 1995 Grand Prix de Tennis de Toulouse.
He reached the final of the 1991 Lagos Open Challenger, partnering Spaniard Daniel Marco.