CSSF director general Claude Marx's comments followed proposals from the EU's securities regulator to introduce new rules concerning the management of cross-border funds from outside the union.
Marx emphasised that the current system relies on cross-border cooperation and that any new rules framework should not impose excessive restrictions on Luxembourg's funds industry, which has close ties to London.
The impact of Britain's exit from the EU will only fully be understood after existing transition arrangements come to an end in December.
