Twitter has engaged Wachtell, Lipton, Rosen & Katz, whose staff includes the former chancellor of the Delaware Chancery Court, where the legal battle will play out.
Leo Strine also served as chief justice of the Delaware Supreme Court prior to joining the lawfirm in 2019.
On Friday, Mr Musk indicated in a filing to the US Securities and Exchange Commission (SEC) that he wanted to pull out of the deal.
He has repeatedly accused the platform of misrepresenting the number of fake accounts on its site.
Twitter’s board chair Bret Taylor responded y saying the company would pursue legal action to force Mr Musk to complete the sale.
The deal between Twitter and Mr Musk had included a $1bn breakup fee, to be paid by the billionaire if the deal failed to go through.
Mr Musk told a high-powered audience of media executives at the Allen & Co Sun Valley Conference in Idaho on Saturday that the decision was “about bots”, CNN reported.
On its website, Wachtell, Lipton, Rosen & Katz said it handles “some of the largest, most complex and demanding transactions in the United States and around the world”.
Twitter did not immediately respond to a request for comment.