10 days ago diagnosed with diabetes. He has never been a dog to eat all his dinner at once (only his chicken) but the dried biscuits he used to go back to when he wanted. Now I have had to change his eating order he does not want to eat the biscuits. It has been suggested ti maybe put some gravey or a few vegetables with it. Any suggestions?

well definitely check with your vet or a dietician because changing your dogs diet can have an effect on his diabetes. If you supplement with extra cards the glucose levels will rise. If you don't provide enough carbs, his sugar will drop (if you are treating him with insulin injections)
So if you try different foods, just try to make sure its an even carb exchange.