Chew said the allegations of domestic abuse had hurt Depp's career.
"For nearly 30 years, Mr Depp built a reputation as one of the most talented actors in Hollywood," Chew said. "Today his name is associated with a lie, a false statement uttered by his former wife.
"Hollywood studios don't want to deal with the public backlash from hiring someone accused of abuse," he said. "A false allegation can devastate a career."
Depp filed the defamation complaint against Heard in the United States after losing a separate, high-profile libel case in London in November 2020 that he brought against The Sun for calling him a "wife-beater."
In 2016, Heard sought a restraining order against Depp. Their divorce was finalized in 2017, with Heard receiving a $7 million settlement.
A panel of seven jurors and four alternates is hearing the case between Depp and Heard, who had a starring role in "Aquaman."