The 25-year-old, who made two international appearances in 2015, is due in the French city later on Monday for a medical ahead of his loan deal, which will not include an option to buy.
Cameroon-born Ntep joined Wolfsburg for five million euros ($6.14 million) last January from Rennes, but failed to score in 15 Bundesliga appearances and has started just once in the league this season.
Struggling Saint-Etienne ended a 10-match winless streak in Ligue 1 by beating Toulouse 2-0 on Sunday, but remain only four points above the relegation zone.
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