"There are still antitrust concerns about the Lloyds-HBOS merger at commission level," Potter told BBC Radio 4's Today programme.
She said that unless the companies withdrew their merger, the commission would continue to work toward making a ruling before the July 12 deadline.
After working with regulatory officials in the European Union, which on Jan . 31dropped an inquiry into the merger, the commission voted 5 to 0 today to close the inquiry without requiring any concessions from the two companies.
The divestments and other conditions will ensure a comparative level of competition in the supply of aluminum sheets for the beverages and cosmetics industries after the merger, the commission said.
It is impractical to reverse the merger, but the commission should say by how much Lloyds should be shrunk.
In its nonhorizontal merger guidelines, the Commission states that conglomerate mergers — mergers involving complementary rather than overlapping products or services — generally do not raise competition concerns.
With large mergers, such as the proposed Massmart-Walmart merger, a "Competition Commission" conducts an investigation and makes a recommendation to a "Competition Tribunal" for decision.
This month the OFT formally requested jurisdiction to investigate the merger from the commission, which had until 1 March to give a decision.
The companies have two months to decide whether to appeal, and may decide to do so even if they unwind the merger, because the commission's decision, if it stands, could cause trouble for future deals.
Even before the merger, the Philharmonic commissioned works including Gershwin's Piano Concerto in F. The first commission after the merger went to Philip James, the first director of the New Jersey Symphony.
