Agree with what has already been said. All we can do is inform the pilot and let them decide. At the end of the day, the captain is responsible for the safety of his aircraft. Air traffic controllers can never force pilots to do something they don't want to do. That said, an engine failure is not really a time critical event (unless there are other factors involved, such as a fire or low fuel). If one engine is still running, the aircraft should still be able to fly perfectly fine, so diverting to another field should be no problem at all.