The Borussia Dortmund star is being heavily linked with a shift to United if current Holland boss Louis van Gaal lands the Old Trafford job.
The 24-year old Germany international told Ruhr Nachrichten that he was unsure if his future lies at Dortmund which his added fuel to the fire regarding his proposed shift to England.
"It's like that in this business. Every player only has one career and wants to get the best out of it," said Reus, who is yet to win a trophy with Dortmund since his 2012 move from Borussia Monchengladbach.
"You have to decide what's best for you. We'll see about that (staying at Dortmund).
"Every footballer has his goals and is dreaming of winning titles. At the end of your career, you want to be able to say that you've won many titles."
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