German flag-carrier Lufthansa is yet to clarify to the European Commission the additional concessions put forward last week in its bid to secure competition clearance for the Austrian Airlines acquisition.
Lufthansa submitted a revised offer on 16 July after the Commission found its previous proposal insufficient.
During a briefing in Brussels today, a European Commission spokesman said the competition regulator was "still awaiting clarifications" on the offer, having held "technical discussions" with Lufthansa over the weekend.
The Commission had offered to meet with Lufthansa's chief, Wolfgang Mayrhuber, today in Brussels to discuss the matter.
"Until such time as we have these clarifications it is impossible to be able to establish whether or not our competition concerns have been met," says the spokesman.
"Until such time as our competition concerns have been met we cannot take a decision - therefore the ball is still in the court of Lufthansa."
Details of the concessions being offered have not been disclosed. Lufthansa is hoping to obtain Commission approval for the Austrian takeover by 31 July.