Uber is as tight as a tick on this, at least until the recommendations are released to the employees on Tuesday.
The recommendations follow an investigation undertaken by Holder and his legal partner, Tammy Albarrán - of the law firm Covington & Burling LLP - who were asked by Uber to investigate claims of sexual harassment in the company.
The CEO of Uber could have to take a leave of absence amid an investigation into the corporate culture.
According to a representative of Uber's board of directors, it has "unanimously voted to adopt all the recommendations of the Holder Report".
Also at the meeting on Sunday, board members were expected to discuss Kalanick temporarily stepping away and possibly returning to a role with less authority. As the New York Times reports, Michael announced his departure to all company's employees in an email Monday morning, though it remains unclear whether he resigned or was terminated.
Privately valued at almost $70 billion, Uber operates in hundreds of cities around the world.
Post a traumatic accident in his family, where Uber CEO Travis Kalanick lost his mother and his father was hospitalized, he has been mulling over the need for some time-off from work. Uber confirmed his departure but declined to comment.
United States attorney general Eric Holder has advised Uber CEO Travis Kalanick to take a leave of absence, but the company board remains silent.
Multiple media outlets reported on Sunday that the board was considering a leave of absence for Mr Kalanick.
It comes shortly after another law firm, Perkins Coie, submitted a separate report on sexual harassment and other employee concerns at the company.
Uber may be run by a management committee, though a single internal executive could also be selected.
According to a report by Quartz, many at Uber were surprised Michael wasn't dismissed after the karaoke bar scandal came to light earlier this year.