European Parliament President Martin Schulz has said he will refer an altercation, which caused Ukip MEP Steven Woolfe to collapse,to an advisory committee.
Mr Schulz said he asked for the parliament's committee to deal with the "very regrettable matter" next week as a matter of "urgency".
"The reported facts are extremely serious," he added. "It goes without saying that disrespectful and violent behaviour does not have a place in the European Parliament.
"Moreover, indulging in this kind of conduct might result in a breach of Rule 11 of Parliament’s Rules of Procedures and of Article 1 of the Code of Conduct for Members of the European Parliament."
Theresa May's cabinet choices show she is more focused on Conservative Party cohesion than the future of Britain, according to the president of the European Parliament.
Martin Schulz said the European Parliament would "work constructively" with the new government, but attacked what he called the "dangerously vicious cycle" of Tory leaders putting political interests first.
Mr Schulz said the composition of the new cabinet "shows that the focus is less on the future of the country but more about satisfying the internal cohesion of the Tory Party".
"Unfortunately, this carries on from what has been the starting point of this unfortunate referendum in the first place," he said.