Bendtner, who is currently on loan from Arsenal, was arrested at the weekend and he has been subsequently banned from playing for his country for six months.
The 25-year old has found opportunities limited since moving to Italy but Bangsbo feels that he has not done himself any favours.
"Yes, I'm disappointed," he told DR Sport. "Because I saw this as an opportunity for him and because at times, when I have worked with him, he has been good at doing the things he was told. He was very focused.
"And this was one of the qualities which made me think I could recommend him to Juventus. He lived up to that for a long time, they were pleased with his attitude and development.
"It is not a big deal at either Juventus or in Italy. There have been a few stories in the Italian newspapers, but it is not something which generates headlines," he continued.
"I think they will handle this matter in a sober way. And I don't think you should expect Nicklas to play more during this period."