Vegetarian..Is is safe to cook my Quorn Turk'y roast after letting it thaw in the fridge for about one week?

I've had my Quorn Turk'y Roast in the fridge for about one week now and finally want to cook it. It's still sealed in the plastic and box just like when you buy it. Can I cook it even though it's recommended to keep it frozen or should I throw it away?