Earlier, the Austrian - whose uncle is the Formula 1 legend Gerhard Berger - tested for the Silverstone-based team thanks to his pink-coloured sponsor BWT.
Yet Perez has now re-signed for 2018, and Frenchman Ocon subsequently announced on Twitter that he is also staying at Force India next year.
Asked how that will affect his own plans, Auer told Servus TV: "Not much. The test was a huge trust in me and I am still in contact, but my focus is on the DTM."
Auer's uncle Berger, who is also the DTM series chief, agreed: "Luki still has chances. Force India has an eye on him.
"You can already see that because he was invited to the test without my help - he really worked it out for himself.
"He has a very good chance of winning the DTM [title]. And with his test, he has shown that coming into Formula 1 is absolutely realistic."
Force India are currently fourth in the 2017 constructors' standings.