Entity framework data annotation of foreign key without a navigation property

I have the definition for the following table:

public partial class ClientClassification
{
    [Key, Column(Order = 0)]
    public long ClientId { get; set; }

    [Key, Column(Order = 1)]
    public ClientClassificationEnum ClientClassificationType { get; set; }

    [ForeignKey("ClientId")]
    public virtual Client Client { get; set; }
}

A foreign key into the Client table is ClientId. This relationship is one to many (a client can have many classifications). Is there a way to declare this foreign key relationship without including the Client navigation property? Hence, something like:

public partial class ClientClassification
{
    [Key, Column(Order = 0)]
    [ForeignKey("Client.ClientId")]
    public long ClientId { get; set; }

    [Key, Column(Order = 1)]
    public ClientClassificationEnum ClientClassificationType { get; set; }
}