Knightley, 31, and Carney have worked together on the film "Begin Again," which also stars Mark Ruffalo and Adam Levine.
Filmmakers, who have previously worked with the actress have now come to her defense, reported People magazine.
Knightley's "Never Let Me Go" director Mark Romanek took to Twitter to praise the actress.
"My experience with Keira Knightley was utterly spectacular on every level. I have no clue what this guy is talking about," Romanek tweeted.
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"She was an absolute dream. Professional, prepared, kind and lovely," Gorman said.
Director of the film Lorene Scafaria said she had a similar experience as Romanek. "I agree with Mark," she tweeted. "Keira was a joy to work w/. Present & easy & really, really good at her job. Just lovely."
Lynn Shelton, who directed the actress in 2014's "Laggies," tweeted, "Working with #KeiraKnightley was magnificent, top to bottom. She is the real deal.