Kalidass Teeluckdharry defended one of the two men who were cleared of killing 27-year-old Michaela at the luxury Legends Hotel, during her honeymoon in January 2011.
The lawyer has been accused of trying to influence the jury after making reference to an "unauthoritative" academic document written by a juror's son in his closing address at the trial.
Mauritius's attorney general, Yatindra Nath Varma, said: "He has deliberately tried to improperly influence the jury and therefore has acted in breach of ... the code of ethics."
A judicial review is expected to challenge the disciplinary hearing on Monday.
Mr Teeluckdharry said on Friday: "I cannot comment because of this judicial review."
The document in question was a thesis about the rights of suspects to consult counsel under the constitution, written by Mouammar Oozeer, whose father was juror Oomar Oozeer.
Mr Teeluckdharry said: "The citing of the work of Mr Mouammar Oozeer was eminently relevant to an important part of the defence's case which was concerned with the unfair and illegal obtaining of a confession by means of police brutality, torture and denial of access to counsel.
"In the course of my closing speech I made reference to Mr Oozeer as an international lawyer because, to the best of my knowledge at the material time, Mr Oozeer had taken up employment as a legal adviser in London after he left the attorney general's office.
"To my mind, working as a lawyer in London gave him an international dimension."
Mr Treebhoowoon, 32, and Sandip Moneea, 43, were found not guilty by a jury of six men and three women in Mauritius last July.