QPR struggled for goals during the most recent campaign, with Idrissa Sylla ending the season as their top scorer in the Championship with 10 strikes.
It has led to manager Ian Holloway wanting to strengthen in that department during the summer transfer window, and it appears that he has turned his focus to France.
According to Get West London, QPR are in the running to sign Saint-Louis, who netted six goals in 28 appearances during a loan spell with Ligue 2 outfit Stade Laval last season.
The 22-year-old is contracted to Saint-Etienne but he has made just one appearance in France's top flight, where he scored in a 3-1 win over Montpellier.
It has been suggested that QPR would have to pay in the region of £525,000 to complete the signing of the forward.