Ronaldo has been linked with Dortmund this week.
Watzke said: "I love this player, it's certainly a lovely idea to watch Cristiano Ronaldo play at Signal Iduna Park.
"But there is no contact between the people involved. That's why we have to stop talking about it..."
Indeed, BILD says Watzke has declined the prospect of signing Ronaldo due to his 37 years.