Kraft and Philadelphia 76ers co-owner Michael Rubin visited the Philadelphia-born rapper on Tuesday.
After the visit, Kraft said Mill's incarceration makes it clear that "we have to do something with criminal justice reform." Rubin said he believes "the right thing will happen" and Mill will be released soon.
Mill, whose real name is Robert Rihmeek Williams, is fighting for release while appealing a two- to four-year sentence for a probation violation.
A judge said his drug use, arrests and other issues while under supervision merited the jail time. Mill's lawyers have accused her of turning the case into a "personal vendetta."
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