"We are analysing all the parameters that are relevant to the BME situation," Boujnah told reporters.

"We are monitoring all the developments around that situation... We will make a decision when we believe we have to make it," the CEO said.

Swiss exchange SIX made a friendly all-cash 2.84 billion euro (£2.38 billion) offer for Madrid bourse BME in November.

Euronext said at the time it was also in talks with BME with a view to a potential bid, without saying how much it was prepared to bid.

"This ongoing analysis may lead to an offer or may not lead to an offer from Euronext," Boujnah said.

He confirmed that has met with Spanish authorities and regulators to discuss a potential bid.

Euronext's chief financial officer Giorgio Modica said a bid for BME around the 3 billion euro mark could not be all in cash and would need an element of equity.

Boujnah also made a reference to the Milan Bourse saying Euronext would be interested in buying Borsa Italiana if it was up for sale.

He said Euronext was the "natural home" for Borsa Italiana which is owned by the London Stock Exchange (LSE), but the UK bourse has made it clear that its Italian operations are not for sale at the moment.

The LSE is waiting for regulatory approval for its proposed $27 billion takeover of data and analytics company Refinitiv, a deal designed to broaden LSE's trading business and make it a major distributor of market data.

Sources previously said it may need to sell some assets to win the blessing of EU competition authorities.

(Reporting by Huw Jones, editing by Pamela Barbaglia)