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Thyssenkrup and Tata Steel are expecting to receive objections from the European Commission over their steel joint venture.
Sources have told Reuters that EU antitrust regulators will hand out a statement of objections to the two firms, setting out serious competition concerns.
"As soon as the statement of objections has arrived we will thoroughly examine the Commission's arguments," a spokesman for Thyssenkrupp said, adding the group continued to be confident that the transaction could be closed in early 2019.
Thyssenkrupp has told Reuters expects to receive in the course of the week a statement of objections from the European Commission over its planned joint venture with Tata Steel.
The European Commission said in October it was concerned customers would face higher prices and fewer suppliers if the merger was allowed to go ahead.
The deal includes the UK's biggest steelworks, at Port Talbot in Wales.
First Minister Mark Drakeford explains why he fears the indirect effect of "no deal" on Welsh steel.