A kickboxer known for being a close personal companion of acclaimed footballer Cristiano Ronaldo has been arrested after allegedly assaulting a waiter.

Badr Hari was arrested in the Moroccan city of Marrakesh on Saturday after allegedly attacking a staffer before breaking the nose of a man who tried to intervene.

The Sun reports Hari attacked the waiter when he tried to clarify whether the heavyweight fighter wanted a glass or a bottle of vodka.

He has since been released on bail.

Hari has been the subject of persistent rumours because of his close friendship with Ronaldo.

Spanish press has reported Ronaldo frequently takes his private jet to Morocco to spend time with the kickboxer.

Hari has a long history of assaults, including a charge of attempted manslaughter on Dutch businessman Koen Everink.

"Almost always it was a minor altercation that led to fierce violence by the accused, which came so unexpectedly that the victims could not defend themselves against it," an Amsterdam court statement read.

Badr Hari holds Cristiano Ronaldo. (Instagram)