Standard & Poor's warned that it could downgrade the credit ratings of AP Moller-Maersk after the Danish shipping giant's $7.45bn sale of its oil and gas subsidiary.

The US credit rating agency put Maersk on "CreditWatch with negative implications", signaling that the review could result in the company's "BBB" rating falling one notch to "BBB-".

That would but the Copenhagen-listed company just a notch away from losing its investment-grade status for its long-term corporate credit rating, which Maersk chief executive Soren Skou has pledged to retain.