The 22-year-old has been linked with the likes of Bayern Munich, Manchester City, Juventus and Real Madrid.
Benfica are reportedly looking for around 30million euros for the talented defender.
Coentrao said: “I do not say many things about this subject. But if a bid is positive for the club, I will accept the exit.
“I am at a big club but is normal that I desire to improve like a professional.”