“Begin Again” director John Carney has some unflattering things to say about actress Keira Knightly. Not that he hates her or her acting, but Carney feels she was not convincing enough as a young singer/songwriter in “Begin Again.”

Carney has vowed not to work with supermodels again though Knightly is not one. His decision is based on his experience of working with the actress in the movie “Begin Again.” Even though Carney does not hate Knightly as a person or her acting, he would just rather work with actors who are curious and real than “movie stars.”

Carney’s new film, “Sing Street,” has opened to rave reviews and the director took an opportunity to criticize Knightly during an interview about it. In an interview with The Independent, Carney was asked about his feelings about the reviews.

“Well, it’s fantastic. I’m very surprised; it’s a small personal movie with no Keira Knightlys in it. It’s really rewarding,” said Carney. According to News.com.au, he worked with Keira Knightly and Mark Ruffalo in “Begin Again.” But he revealed that working with her entourage was difficult.

“Not that I didn’t enjoy ‘Begin Again’ but Keira has an entourage that follows her everywhere so it’s very hard to get any real work done, and so I was very ready to come back to Ireland and make films that nobody cared about who was in it or any of that crap,” added Carney.

Daily Mail informs that the director continued with his criticism of the actress, saying that she has a tendency to hide her real self in front of the camera. He also slammed her for her singing and guitar playing skills. “I don’t want to rubbish Keira, but you know it’s hard being a film actor and it requires a certain level of honesty and self-analysis that I don’t think she’s ready for yet and I certainly don’t think she was ready for on that film,” he said.

“As much as I tried to make it work I think that she didn’t quite come out as a guitar-playing singer-songwriter,” he added.

His final attack on the actress came after he was asked about his takeaways from the movie. “I learned that I’ll never make a film with supermodels again,” he said.