If you're a Crystal Palace supporter, you can be forgiven for not knowing who you are going to get as your manager.
First, Roy Hodgson retires. Then you think you might get Nuno Espirito Santo. When that falls down, you are pretty sure it's going to be Lucien Favre, the former Borussia Dortmund manager.
Even the club are certain it will happen. Only, at the final moment, it doesn't. And suddenly, Patrick Vieira is the man in charge: a legend on the pitch but still learning in the dugout. It is the biggest test of his managerial career following roles at Manchester City's academy, New York City and Nice.