Last week, sources told Reuters that Vestager would give the green light to the $130 billion Dow Chemical (>> Dow Chemical Co) and DuPont (>> E I Du Pont De Nemours And Co) merger this week.

Approval could also be granted to ChemChina's [CNNCC.UL] $43 billion bid for Syngenta (>> Syngenta AG) at the same time although the timing could still change, the people said.

Both deals gained EU antitrust clearance after pledges to sell assets to address competition concerns, the sources said.

Vestager is also set this week to block the fifth attempt by Deutsche Boerse and London Stock Exchange (>> London Stock Exchange Group Plc) to join forces and create Europe's biggest exchange.

(Reporting by Foo Yun Chee; editing by Philip Blenkinsop)