MGM Mirage, the gaming operator that owns some of the world’s best-known casinos, warned on Tuesday that it is at risk of defaulting on its debt, underscoring the steep downturn in the global gaming sector.

In a regulatory filing to explain the delayed release of its fourth-quarter earnings, MGM Mirage – which counts billionaire Kirk Kerkorian as its biggest shareholder – said it was “still in the process of assessing its financial position and liquidity needs”.