He told Bloomberg that EU leaders are working on how the regulation of financial derivatives, including naked short-selling and credit default swaps, can be done more effectively.
Mr Barnier said a ban is an "option on which we are working".
"It's an option that we are studying with seriousness. I want transparency, control and standardization," he stated.
He added that an accord on the regulation of hedge fund and private equity firm management is close to being reached and is hopeful a deal can be agreed by September.
Earlier this month, Mr Barnier announced details of new rules which will apply to investment funds in Europe.
The changes include the introduction of a new standardized investor document, which is intended to improve the decision-making process for those planning to put money into such vehicles.
By Asim Shah