Ithaca Energy said it has received a statement of claim from a law firm regarding work on its Greater Stella area asset in the North Sea.
The company said the claim relates to a reported misrepresentation of information regarding the completion of modifications at a floating production in the North Sea.
A spokesman said it related to modification works being completed by Petrofac.
He added: “The company vigorously refutes any such allegations and strongly denies any suggested wrongdoing.
“The company will be taking all necessary legal measures to defend itself against the statement of claim.”