They are seeking to persuade them to sign a composition agreement - a contract whereby creditors accept a partial payment of what they are owed - but if they fail to agree terms or creditors are unconvinced by Straumur's plans to sell West Ham to another buyer, the bank will be subjected to a winding-up order.
Three attorneys from Iceland's supreme court would place Straumur's assets, including West Ham, into bankruptcy, leaving the club open to potential sanctions from the Premier League, which could include points deductions or even relegation.
A League spokesman confirmed they have asked West Ham to supply documents clarifying the club's change of ownership.
He said: "Once we have that information, we will assess it and act accordingly."