In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].

It could be football's greatest ever dynasty – Zinedine Zidane as Real Madrid's head coach and his four sons out on the pitch in the famous white shirts playing for him. It sounds far-fetched, but then so does the idea that Zidane could be Real's B-team coach and that his offspring would be at various levels of the club's youth system – which is already a reality. Sportsmail looks at the chances of things going to the next level. VIDEOS Scroll down to watch Theo prove he's a chip off the old block Zinedine Zidane is currently Real Madrid's B-team coach and could replace Carlo Ancelotti at the BernabeuZinedine Zidane is currently the Real Madrid B-team (Castilla) coachFlorentino Perez wants former star to be manager at Real in the futureZidane has four sons - Enzo, Luca, Theo and Elyaz all playing at the clubEnzo is a No 10 like his father while Luca is an impressive goalkeeperIt could be football's greatest ever dynasty if all four make it in the gameCLICK HERE for all the latest Real Madrid news 
 Question:But by then _ may have moved on and Zidane may have stepped up to replace him.
Carlo Ancelotti